Oxidative hair lightening product with controlled swelling behavior

Abstract

The invention relates to oxidative hair lightening products, in particular bleaching powders and bleaching pastes, comprising a content of biodegradable complexing agents which do not swell or heat up too much when mixed with an aqueous hydrogen peroxide preparation, thus lightening the hair or lightening dyeing the hair in a gentle manner.

Description

[0001]Henkel AG & Co. KGaA March 24, 2023 "Oxidative hair lightening agent with controlled swelling behavior" The present invention relates to oxidative hair lightening agents, in particular bleaching powders and bleaching pastes, with a reduced content of biodegradable complexing agent, which do not heat up excessively even when applied to hair with a higher metal or heavy metal content and thus gently lighten or lighten the hair. Furthermore, the present invention relates to the use of the agents for gently bleaching or oxidative lightening or for lightening the hair. Furthermore, the present invention relates to a multi-component packaging unit (kit of parts) for lightening or lightening the hair of keratin fibers, which comprises an oxidative hair lightening agent and, separately,an oxidizing agent preparation. Furthermore, a method for oxidative lightening or for lightening coloring of keratin fibers using the said oxidative hair lightening agent and the kit comprising this oxidative hair lightening agent is described. The oxidative hair lightening agent according to the invention is a substantially anhydrous oxidizing agent preparation containing at least one persalt. The substantially anhydrous oxidative hair lightening agent is preferably in powder or paste form. Lightening one's own hair color has always been the desire of many consumers, since a blonde hair color is considered attractive and desirable from a fashion point of view. For this purpose, various bleaching agents with different bleaching performance are available on the market. The oxidizing agents contained in these products are capable ofto lighten the hair fiber through the oxidative destruction of the hair's natural pigment, melanin. For a moderate bleaching effect, the use of hydrogen peroxide – optionally with the addition of ammonia or other alkalizing agents – as the oxidizing agent alone is sufficient. To achieve a stronger bleaching effect, a mixture of hydrogen peroxide and at least one compound selected from persalts, especially peroxodisulfate salts and / or peroxomonosulfate salts, is usually used. To enhance the bleaching effect, the products contain higher concentrations of hydrogen peroxide and persalts, especially persulfates. Dark, dark brown, or black hair can thus be lightened by 4 to 6 shades in a single step. The hydrogen peroxide and the persalt-containing hair lightening product are stored separately until use to avoid premature deactivation of the persalts. The hydrogen peroxide component,which comprises an aqueous solution of hydrogen peroxide, has an acidic pH value, in particular a pH value of 1.5 to 5.5, in particular of 3 to 5, in each case measured at 20°C, to stabilize the hydrogen peroxide. However, for the melanin-degrading effect of the hydrogen peroxide and the bleaching effect on the keratinic fiber, it is advantageous if the application mixture of hydrogen peroxide solution and persalt-containing hair lightening agent has an alkaline pH value which is in the range of 8.0 to 11.5, preferably in the range of 8.5 to 11.0, particularly preferably 9.0 - 10.5, extremely preferably 9.5 - 10.0, in each case measured at 20°C. To adjust an alkaline pH value of the lightening application mixture, preferred oxidative hair lightening agents according to the invention can contain, in addition to the at least one persalt, at least one powdered alkalizing agent in such a total amount thatthat the application mixture has the desired alkaline pH. Alternatively, a third composition can be added to the application mixture of the oxidative hair lightening agent according to the invention and hydrogen peroxide solution, which contains one or more alkalizing agents in such an amount that the application mixture has an alkaline pH in the range from 8.0 to 11.5, preferably in the range from 8.5 to 11.0, particularly preferably 9.0 to 10.5, extraordinarily preferably 9.5 to 10.3, in each case measured at 20°C. If oxidation dye precursors and / or direct dyes are added to the oxidative hair lightening agent, the hair can be colored simultaneously. Corresponding hair colorants are offered in particular for consumers with very dark, melanin-rich hair. One requirement for the oxidative hair lightening agent according to the invention was to color the hair despite the harsh chemical conditions,that prevail during oxidative bleaching, without compromising the quality of the bleaching. The active ingredients used for this purpose should be as environmentally friendly as possible. The use of complexing agents in higher concentrations to reduce hair damage during oxidative hair treatment was already known from WO2002089754A1, WO2002074272A1, and WO2002074273A1. EP1714634A1 discloses a hair treatment kit for coloring human hair, comprising a first compartment containing a complexing agent and a second compartment containing a coloring agent. The complexing agent is intended to prevent undesirable reactions on and with hair that lead to undesirable heating of the agent during the preparation of the application mixture and its exposure time on the hair. Many bleaching products on the market contain HEDP (1-hydroxyethane-1,1-diphosphonic acid) as complexing agents.Etidronic acid) or its salts or EDTA (ethylenediaminetetraacetic acid) or its salts. Both HEDP and EDTA effectively stabilize hydrogen peroxide and complex existing metal ions so efficiently that an undesirable temperature increase during use is virtually completely avoided. A major disadvantage of HEDP and EDTA, however, is their poor biodegradability. Especially recently, consumers have been paying increasing attention to the ecological profile of the cosmetic products they use. Consumers prefer, above all, sustainable cosmetics with biodegradable ingredients. The use of substances of natural origin as complexing agents is also already known in the prior art. For example, FR2852834A1 discloses agents for bleaching, coloring, or styling hair.which contain the combination of at least one oxidizing agent and at least one polyhydroxycarboxylic acid. Even though the polyhydroxycarboxylic acids of FR2852834A1 are readily biodegradable, the performance characteristics of the agents described in this document still require improvement, particularly with regard to heat development, which is particularly unfavorable in the presence of gluconic acid and its salts, and with regard to bleaching performance. However, the performance characteristics of the agents disclosed in the aforementioned documents still require improvement. In particular, the temperature development occurring during application to the hair still requires further optimization. Since chemical reactions occur when the anhydrous bleaching agent (non-compressed powder or paste) is mixed with the aqueous hydrogen peroxide solution, in which gaseous oxygen is released,The ready-to-use bleaching agent swells more and more during the application time on the hair. It initially changes from a cream to a foamy swell. Due to the coarse-pored foam texture, the ready-to-use bleaching agent does not adhere sufficiently to the hair fiber. This means that less ready-to-use bleaching agent, and thus less bleaching agent, reaches the hair fiber. To minimize foam formation, it is recommended to keep the surfactant content in the bleaching agent as low as possible or to formulate the product free of surfactants and emulsifiers. This can lead to a conflict of objectives, as ready-to-use bleaching agents are often formulated with a certain amount of oil and / or fatty components to minimize hair damage during the harsh oxidative hair treatment. To make the oil and fatty components miscible with the aqueous hydrogen peroxide solution,However, the presence of emulsifiers may sometimes be unavoidable. Certain silicone compounds can suppress foam formation, but these bleaching agents should be formulated without the addition of silicone compounds for reasons of ecological sustainability. In addition to the surfactant or emulsifier content, the thickeners used in the anhydrous bleaching powder or paste are primarily responsible for foam formation. These thickeners, which are essentially hydrophilic polymer thickeners, result in the ready-to-use bleaching agent, when the anhydrous bleaching agent (uncompressed powder or paste) is mixed with the aqueous hydrogen peroxide solution, taking on a cream-like consistency that is initially easy to apply to the hair, but then solidifies as much as possible during the contact time.so that it does not drip down from the hair or flow onto the scalp. A further requirement for the present bleaching agents was the avoidance of polymers that include acrylic acid, acrylic acid amides, acrylic acid esters, methacrylic acid, methacrylic acid amides, methacrylic acid esters, vinylpyrrolidones, vinyl acetate, vinyl alcohol, and / or styrenes as chain-forming monomers. Therefore, the hydrophilic polymer thickeners should be based on natural raw materials. Furthermore, the development of reaction heat when mixing the anhydrous bleaching agent with the aqueous hydrogen peroxide solution should be as low as possible in order to avoid thermal irritation of the scalp. Preliminary tests have shown that the heat development can be influenced by the choice of complexing agent. But here, too, the choice of thickener plays a certain role. The object of the present invention was to develop oxidative hair lightening agents,In particular, bleaching agents or agents for oxidative color change, with biodegradable complexing agents, which, in terms of their bleaching performance, are as superior as possible to the bleaching or lightening agents known from the prior art. Furthermore, the bleaching agents should have sufficiently high stability and not heat up excessively, even when applied to hair with a higher metal or heavy metal content. It was also the object of the present invention to provide oxidative hair lightening agents, in particular bleaching agents or agents for oxidative color change, which are optimally suited for application at the hairline, i.e., near the scalp. On the one hand, the bleaching agent must be strong enough to damage the undamaged,To effectively lighten the roots of hair that is stable and therefore particularly difficult to lighten. On the other hand, the skin irritation potential of the ready-to-use bleaching agent must be kept as low as possible, since at least small amounts of the product can inevitably come into contact with the scalp when applied to the roots. To achieve this, the ready-to-use product should develop a creamy, compact consistency and form a crust after application. Furthermore, the volume development during the preparation of the ready-to-use bleaching agent should be minimized.This is particularly important for the application of the product with the aid of foils to achieve highlights. The ingredients used should be as ecologically sustainable as possible. Surprisingly, these objects were achieved by the subject matter of the claims. The complexing agents b) are described as biodegradable and therefore represent an ecologically advantageous replacement for HEDP and EDTA. Keratin-containing or keratinic fibers are understood according to the invention to mean, in particular, human hair, but also fur, wool, and feathers. A first subject matter of the present invention is an oxidative hair lightening agent for lightening or for lightening-dyeing hair, comprising a) at least one oxidizing agent selected from the inorganic salts of a peroxosulfuric acid, as well as mixtures of these salts, b) furthermore at least one complexing agent selected from complexing agents of the general formula (I),where R1 represents a hydrogen atom, a C1-C6 alkyl group, a hydroxy-C2-C6 alkyl group, a carboxy-C1-C6 alkyl group or a physiologically acceptable salt thereof, R2, R3 independently represent a hydrogen atom, a C1-C6 alkyl group, a hydroxy-C2-C6 alkyl group, a carboxy-C1-C6 alkyl group or a physiologically acceptable salt thereof, where R2 and R3 do not simultaneously represent a hydrogen atom and not simultaneously a carboxy-C1-C6 alkyl group, M1, M2 independently represent a hydrogen atom or an alkali metal ion, preferably sodium, potassium, or an ammonium ion (NH4, +), and c) at least one salt selected from ammonium chloride and potassium chloride and mixtures thereof, d) and 0 to 10 wt.%, preferably 0.1 to 8 wt.%, particularly preferably 0.5 to 5 wt.% water, in each case based on the weight of the oxidative hair lightening agent. The oxidative hair lightening agent, which is essentially anhydrous with 0 to 10 wt.% water, is preferably in powder, tablet, granular or paste form. The term “powder” or “powdery” according to the invention is to be understood as meaning a free-flowing dosage form consisting of individual particles which is solid at 20 °C and 1013 mbar and in which the individual particles have particle sizes in the range from 0.1 μm to a maximum of 1.6 mm. The particle size distribution can preferably be determined by means of laser diffraction measurement in accordance with ISO 13320-1 (2009).If necessary, the particles can be adapted in their grain size to the requirements of the bleaching powder by physical treatment, such as sieving, pressing, granulating or pelletizing, or by the addition of certain excipients, in order to enable, for example, better miscibility of the individual powder components or miscibility of the bleaching powder with a hydrogen peroxide preparation. Bleaching powders preferred according to the invention have a bulk density in the range of 400 to 1000 g / l (grams / liter), preferably 450 to 900 g / l, particularly preferably 550 to 820 g / l. The bulk density is preferably determined according to EN ISO 60 (version 01 / 2000) or DIN ISO 697 (version 01 / 1984). Unless otherwise stated, all temperature specifications refer to a pressure of 1013 mbar. The oxidative hair lightening agent according to the invention can also be in tablet form.For this purpose, a bleaching powder according to the invention is preferably pressed into a tablet. The oxidative hair lightening agent according to the invention can also be in granular form. For this purpose, a bleaching powder according to the invention is preferably processed into granules. The terms "paste" or "paste-like" are understood according to the invention to mean a dosage form which, at 20°C and 1013 mbar, has a viscosity in the range of 200,000 to 1,600,000 mPas, preferably 250,000 to 1,400,000 mPas, particularly preferably 300,000 to 1,000,000 mPas, extraordinarily preferably 400,000 to 750,000 mPas. The paste viscosity is preferably determined using a Brookfield; instrument RVDV II+; spindle no. 96, 4 revolutions per minute, at 20°C. The oxidative hair lightening agent according to the invention contains as a first essential component at least one oxidizing agent selected from the inorganic salts of a peroxosulfuric acid and mixtures thereof.Peroxosulfuric acids are understood to mean peroxodisulfuric acid and peroxomonosulfuric acid (Caro's acid). Preferably, the at least one inorganic salt of a peroxosulfuric acid is selected from ammonium peroxodisulfate, ammonium peroxomonosulfate, alkali metal peroxodisulfates, alkali metal peroxomonosulfates, and alkali metal hydrogen peroxomonosulfates. Particular preference is given to potassium peroxodisulfate, sodium peroxodisulfate, ammonium peroxodisulfate, and potassium hydrogen peroxomonosulfate, as well as mixtures thereof. Furthermore, it has proven particularly preferred in the work on the present invention if the oxidative hair lightening agent according to the invention contains at least two different peroxodisulfates. Preferred peroxodisulfate salts are potassium peroxodisulfate-ammonium peroxodisulfate mixtures, potassium peroxodisulfate-ammonium peroxodisulfate-sodium peroxodisulfate mixtures and potassium peroxodisulfate-sodium peroxodisulfate mixtures.Particularly preferred are mixtures of potassium peroxodisulfate and ammonium peroxodisulfate, and extremely preferred are mixtures of potassium peroxodisulfate and ammonium peroxodisulfate with an excess of potassium peroxodisulfate, which are free of sodium peroxodisulfate. Particularly preferred mixtures of potassium peroxodisulfate (KPS) and ammonium peroxodisulfate (APS) according to the invention, which are free of sodium peroxodisulfate, are those with a KPS / APS weight ratio in the range of 4:1 to 2:1, preferably 3.5:1 to 2.5:1, particularly preferably 3.2:1 to 2.8:1. Preferred oxidative hair lightening agents according to the invention contain at least one oxidizing agent selected from inorganic salts of a peroxosulfuric acid and mixtures thereof, in a total amount of 5-85% by weight, preferably 10-70% by weight, particularly preferably 17-55% by weight, extraordinarily preferably 22-45% by weight, in each case based on the weight of the oxidative hair lightening agent.The oxidative hair lightening agent according to the invention contains, as a second essential component, at least one complexing agent b) selected from complexing agents of the general formula (I), wherein R1 represents a hydrogen atom, a C1-C6 alkyl group, a hydroxy-C2-C6 alkyl group, a carboxy-C1-C6 alkyl group or a physiologically acceptable salt thereof, R2, R3 independently of one another represent a hydrogen atom, a C1-C6 alkyl group, a hydroxy-C2-C6 alkyl group, a carboxy-C1-C6 alkyl group or a physiologically acceptable salt thereof, wherein R2 and R3 do not simultaneously represent a hydrogen atom and not simultaneously a carboxy-C1-C6 alkyl group, M1, M2 independently of one another represent a hydrogen atom or an alkali metal ion, preferably sodium, potassium, or an ammonium ion (NH4). +). The following are examples of the substituents R1, R2 and R3 mentioned in formula (I) which are particularly suitable according to the invention. Examples of C1-C6 alkyl radicals are -CH3, -CH2CH3, -CH2CH2CH3, -CH(CH3)2, -CH2CH(CH3)2, -CH(CH3)CH2CH3, -C(CH3)3, -(CH2)4CH3, -(CH2)5CH3. Particularly preferred C1-C6 alkyl radicals are methyl and ethyl; an extraordinarily preferred C1-C6 alkyl radical is methyl. Examples of C1-C6 hydroxyalkyl groups are -CH2OH, -CH2CH2OH, -CH2CH2CH2OH, -CH2CH(OH)CH3 and -CH2CH2CH2CH2OH, with -CH2CH2OH being preferred. Examples of carboxy-C1-C6-alkyl groups are HOOC-CH2-, HOOC-CH2-CH2-, HOOC-CH2-CH2-CH2-, HOOC-CH2-CH2-CH2-CH2-, with the group HOOC-CH2- being extremely preferred according to the invention.In the complexing agents of general formula (I), the radical R1 represents a hydrogen atom, a C1-C6 alkyl group, a hydroxy-C2-C6 alkyl group, a carboxy-C1-C6 alkyl group, or a physiologically acceptable salt of a carboxy-C1-C6 alkyl group. Physiologically acceptable salts are those salts that can be used in cosmetics under physiological conditions without adverse effects. Examples of a physiologically acceptable salt of a carboxy-C1-C6 alkyl group include the sodium salt, the potassium salt, and the ammonium salt of the carboxy-C1-C6 alkyl group.A particularly strong improvement in terms of reduced heat development was observed with agents according to the invention which contained at least one complexing agent (a) of the general formula (I), in which the radical R1 stands for a carboxy-C1-C6-alkyl group or for a physiologically acceptable salt thereof, preferably for a carboxymethyl group or for a physiologically acceptable salt thereof, particularly preferably for the sodium salt of a carboxymethyl group. In a particularly preferred embodiment, an agent according to the invention is characterized in that it contains at least one complexing agent (b) of the general formula (I), where R1 stands for a carboxy-C1-C6-alkyl group or for a physiologically acceptable salt thereof, preferably for a carboxymethyl group or for a physiologically acceptable salt thereof, particularly preferably for the sodium salt of a carboxymethyl group.In the complexing agents of the general formula (I), the radicals R2 and R3 independently of one another represent a hydrogen atom, a C1-C6 alkyl group, a hydroxy-C2-C6 alkyl group, a carboxy-C1-C6 alkyl group or a physiologically acceptable salt thereof, where R2 and R3 do not each simultaneously represent a hydrogen atom and a carboxy-C1-C6 alkyl group. In bleaching tests, particularly good results with regard to lightening performance and reduced heat development were also achieved when at least one complexing agent (b) of the formula (I) was used in the agent according to the invention, in which one of the radicals R2 or R3 represents a hydrogen atom and the other of the radicals R2 or R3 represents a methyl group.In a particularly preferred embodiment, a composition according to the invention is characterized in that it contains at least one complexing agent (b) of the general formula (I), in which one of the radicals R2 or R3 represents a hydrogen atom and the other of the radicals R2 or R3 represents a methyl group. The best results in terms of lightening performance and reduced heat development were obtained with complexing agents (b) of the formula (I), in which R1 represents a carboxymethyl group or a physiologically acceptable salt thereof, in particular the sodium salt, R2 represents a methyl group, and R3 represents a hydrogen atom.In a particularly preferred embodiment, an agent according to the invention is characterized in that it contains at least one complexing agent (b) of the general formula (I), where R1 represents a carboxymethyl group or an alkali metal or ammonium salt thereof, R2 represents a methyl group, and R3 represents a hydrogen atom. An explicitly particularly preferred complexing agent (b) of this embodiment is N,N-bis(carboxymethyl)-L-alanine, which can also be referred to as 2-methyl-2',2'',2'''-nitrilotriacetic acid and is abbreviated to "MGDA" (methylglycinediacetic acid). MGDA has the CAS number 29578-05-0. MGDA has the formula (Ia). The alkali metal salts and ammonium salts of MGDA are also preferred according to the invention. Trisodium methylglycine diacetate is particularly preferred. MGDA has a stereogenic center. Both the D-form and the L-form, as well as a mixture of D- and L-forms, are according to the invention. Particularly preferred oxidative hair lightening agents according to the invention are characterized in that the at least one complexing agent b), which is selected from complexing agents (b) of the formula (I) or an alkali metal or ammonium salt of this acid, is present in a total amount of 0.1 to 5.0 wt.%, preferably 0.2 to 2.0 wt.%, particularly preferably 0.4 to 1.6 wt.%, extremely preferably 0.5-1.0 wt.%, in each case based on the weight of the oxidative hair lightening agent according to the invention. Further oxidative hair lightening agents which are particularly preferred according to the invention are characterized in that the at least one complexing agent b), which is selected from methylglycinediacetic acid and its alkali metal or ammonium salts, is present in a total amount of 0.1 to 5.0% by weight, preferably 0.2 to 2.0% by weight.-%, particularly preferably 0.4 to 1.6 wt.%, extraordinarily preferably from 0.5 to 1.0 wt.%, in each case based on the weight of the oxidative hair lightening agent. Further oxidative hair lightening agents which are particularly preferred according to the invention are characterized in that the at least one complexing agent b), which is selected from the sodium salts of methylglycinediacetic acid, is contained in a total amount of 0.1 to 5.0 wt.%, preferably 0.2 to 2.0 wt.%, particularly preferably 0.4 to 1.6 wt.%, extraordinarily preferably from 0.5 to 1.0 wt.%, in each case based on the weight of the oxidative hair lightening agent. Further oxidative hair lightening agents which are particularly preferred according to the invention are characterized in that the trisodium salt of methylglycinediacetic acid is present in an amount of 0.1 to 5.0% by weight, preferably 0.2 to 2.0% by weight, particularly preferably 0.4 to 1.6% by weight, extremely preferably 0.5 - 1.0% by weight.-%, in each case based on the weight of the oxidative hair lightening agent. The oxidative hair lightening agent according to the invention contains, as a third essential ingredient, at least one salt selected from ammonium chloride and potassium chloride and mixtures thereof. Surprisingly, it has been found that ammonium chloride or potassium chloride can have a very favorable effect on various application properties of the oxidative hair lightening agent according to the invention after mixing with an aqueous hydrogen peroxide preparation, in particular by reducing the undesirable swelling or foaming of the ready-to-use bleaching agent mixture. Preferred oxidative hair lightening agents according to the invention are characterized in that ammonium chloride is present in an amount of 0.1 to 10.0 wt.%, preferably 1.0 to 8.0 wt.%, particularly preferably 2.0 to 6.0 wt.%, extraordinarily preferably 3.1 - 5.0 wt.-%, in each case based on the weight of the oxidative hair lightening agent. Further oxidative hair lightening agents preferred according to the invention are characterized in that potassium chloride is contained in an amount of 0.1 to 10.0 wt.%, preferably from 1.0 to 8.0 wt.%, particularly preferably from 2.0 to 6.0 wt.%, extraordinarily preferably from 3.1 to 5.0 wt.%, in each case based on the weight of the oxidative hair lightening agent. The oxidative hair lightening agents according to the invention are anhydrous, which in the sense of the present invention means that they contain, in each case based on their weight, 0 to 10 wt.%, preferably 0.1 to 8 wt.%, particularly preferably 0.5 to 5 wt.% water. These details relate to the free water content. A content of molecularly bound water or water of crystallization, which individual powder constituents may have, is not taken into account.The water content can be determined, for example, using Karl Fischer titration based on ISO 4317 (version 2011-12). Particularly preferred oxidative hair lightening agents according to the invention are characterized in that they contain at least one amino acid selected from alpha-amino acids, beta-amino acids, and the salts of an alpha-amino acid or beta-amino acid, as well as mixtures of these substances. An amino acid is understood to be a chemical compound with an amino group and a carboxylic acid group. The class of amino acids includes organic compounds that contain at least one amino group (–NH2 or substituted –NR2) and one carboxyl group (–COOH) as functional groups, thus exhibiting structural features of amines and carboxylic acids. Chemically, they can be differentiated according to the position of their amino group relative to the carboxyl group.If the amino group on the Calpha atom is directly adjacent to the terminal carboxyl group, this is called alpha-position (Į-position) and the term "alpha-amino acids" is used. If the amino group is on the Cbeta atom, as seen from the terminal carboxyl group, this is called beta-position (E-position) and the term "beta-amino acids" is used. Alpha-amino acids and beta-amino acids with a total number of carbon atoms from C2-C20, more preferably from C2-C15, and most preferably from C2-C10 are preferred.In a further particularly preferred embodiment, an agent according to the invention is characterized in that it contains at least one amino acid (c) from the group consisting of arginine, serine, histidine, lysine, asparagine, glutamine, cysteine, methionine, tryptophan, alanine, aspartic acid, glutamic acid, glycine, isoleucine, leucine, phenylalanine, proline, threonine, tyrosine, valine and taurine, the salts of the aforementioned amino acids and mixtures of these substances. Amino acids (c) that are extraordinarily preferred according to the invention are selected from the group consisting of arginine, serine, the salts of the aforementioned amino acids and mixtures of these substances. Agents that are extraordinarily preferred according to the invention are characterized in that they contain at least one amino acid (c) selected from the group consisting of arginine, serine, the salts of the aforementioned amino acids and mixtures of these substances.Chiral amino acids possess a stereogenic center and can occur in mirror-image forms. For example, arginine occurs in the form of L-arginine and D-arginine. Both the L-form of an amino acid and its D-form, as well as mixtures thereof, are encompassed by the present invention. Within the scope of the present invention, both possible enantiomers can therefore be used equally as a specific compound or as mixtures thereof, particularly as racemates. However, it is particularly advantageous to use the naturally occurring isomer form, usually the L-configuration.Accordingly, a particularly preferred agent according to the invention is characterized in that it contains at least one amino acid (c) from the group consisting of L-arginine, L-serine, L-histidine, L-lysine, L-asparagine, L-glutamine, L-cysteine, L-methionine, L-tryptophan, L-alanine, L-aspartic acid, L-glutamic acid, glycine, L-isoleucine, L-leucine, L-phenylalanine, L-proline, L-threonine, L-tyrosine and L-valine and taurine, the salts of the aforementioned amino acids and mixtures of these substances. Further oxidative hair lightening agents which are particularly preferred according to the invention are characterized in that the at least one alpha-amino acid or beta-amino acid and / or its salt is contained in a total amount, converted to the mass of free amino acid, of 0.1 to 3.0% by weight, preferably 0.2 to 1.5% by weight, particularly preferably 0.3 to 0.6% by weight, extraordinarily preferably 0.4 - 0.5% by weight, in each case based on the weight of the oxidative hair lightening agent.Oxidative hair lightening agents which are extraordinarily preferred according to the invention contain at least one alpha-amino acid selected from arginine, serine or at least one salt of these amino acids, in a total amount, converted to the mass of free amino acid, of 0.1 to 3.0% by weight, preferably 0.2 to 1.5% by weight, particularly preferably 0.3 to 0.6% by weight, extraordinarily preferably 0.4 - 0.5% by weight, in each case based on the weight of the oxidative hair lightening agent. Oxidative hair lightening agents which are extraordinarily preferred according to the invention contain at least one amino acid selected from L-arginine, L-serine or at least one salt of these amino acids in a total amount, converted to the mass of free amino acid, of 0.1 to 3.0% by weight, preferably 0.2 to 1.5% by weight, particularly preferably 0.3 to 0.6% by weight, extraordinarily preferably 0.4 - 0.5% by weight, in each case based on the weight of the oxidative hair lightening agent.Further oxidative hair lightening agents preferred according to the invention contain polyquaternium-4. Polyquaternium-4 is hydroxyethylcellulose quaternized with diallyldimethylammonium chloride (INCI: Polyquaternium-4). Surprisingly, it has been found that polyquaternium-4 can further optimize the swelling behavior of oxidative hair lightening agents preferred according to the invention after mixing with an aqueous hydrogen peroxide preparation. Polyquaternium-4 is particularly preferably present in a total amount of 0.01 to 3.0 wt.%, preferably 0.1 to 1.0 wt.%, particularly preferably 0.1 to 0.7 wt.%, extremely preferably 0.3-0.5 wt.%, in each case based on the weight of the oxidative hair lightening agent.For the melanin-degrading effect of hydrogen peroxide and the bleaching effect on the keratinic fiber, it is advantageous if the application mixture of hydrogen peroxide solution and persalt-containing hair lightening agent has an alkaline pH in the range from 8.0 to 11.5, preferably in the range from 8.5 to 11.0, particularly preferably 9.0 - 10.5, extraordinarily preferably 9.5 - 10.3, in each case measured at 20°C. To set an alkaline pH of the lightening application mixture, preferred oxidative hair lightening agents according to the invention can contain, in addition to the at least one persalt, at least one powdered alkalizing agent in such a total amount that the application mixture of the oxidative hair lightening agent according to the invention and the hydrogen peroxide solution has the desired alkaline pH.Alternatively, a third composition containing one or more alkalizing agents in an amount such that the application mixture has an alkaline pH in the range from 8.0 to 11.5, preferably in the range from 8.5 to 11.0, particularly preferably 9.0 to 10.5, extraordinarily preferably 9.5 to 10.3, in each case measured at 20°C. Oxidative hair lightening agents preferred according to the invention are therefore characterized in that they contain at least one inorganic alkalizing agent that is solid at 20°C and 1013 mbar. Particularly preferred oxidative hair lightening agents according to the invention contain at least one inorganic alkalizing agent which is solid at 20 °C and 1013 mbar in a total amount of 4 - 70 wt.%, preferably 10 - 60 wt.%, particularly preferably 15 - 50 wt.%, further particularly preferably 20 - 55 wt.-%, extremely preferably 30-40 wt.%, in each case based on the weight of the oxidative hair lightening agent. Further oxidative hair lightening agents preferred according to the invention contain at least one inorganic alkalizing agent that is solid at 20°C and 1013 mbar, including, in a total amount of 0.1 to 50 wt.%, preferably 4 to 30 wt.%, particularly preferably 10-15 wt.%, in each case based on the weight of the oxidative hair lightening agent, at least one sodium silicate or sodium metasilicate with a molar SiO2 / Na2O-9HUKlOWQLV^YRQ^^^^^^EHYRU]XJW^^^^-3.5. Further oxidative hair lightening agents preferred according to the invention contain at least one inorganic alkalizing agent which is solid at 20 °C and 1013 mbar, including in a total amount of 0.1 to 20 wt.%, preferably 1 to 15 wt.%, particularly preferably 3 - 10 wt.-%, in each case based on the weight of the oxidative hair lightening agent, at least one sodium silicate or sodium metasilicate with a molar SiO2 / Na2O ratio of 0.9 - 1.1, preferably 1. Further oxidative hair lightening agents preferred according to the invention contain at least one inorganic alkalizing agent that is solid at 20 °C and 1013 mbar, including, in a total amount of 0.1 to 40 wt.%, preferably 1 to 30 wt.%, particularly preferably 5 - 25 wt.%, in each case based on the weight of the oxidative hair lightening agent, at least one alkaline earth metal hydroxide carbonate or an alkaline earth metal carbonate and mixtures thereof. Alkaline earth metal hydroxide carbonates preferred according to the invention are magnesium hydroxide carbonates with the formula MgCO3 · Mg(OH)2 · 2 H2O and those with the formula MgCO3 · Mg(OH)2.Further preferred oxidative hair lightening agents according to the invention contain at least one inorganic alkalizing agent which is solid at 20 °C and 1013 mbar, including, in a total amount of 0.1 to 40 wt.%, preferably 1 to 30 wt.%, particularly preferably 5 - 25 wt.%, in each case based on the weight of the oxidative hair lightening agent, at least one magnesium hydroxide carbonate which is preferably selected from magnesium hydroxide carbonates with the formula MgCO3· Mg(OH)2· 2 H2O and magnesium hydroxide carbonates with the formula MgCO3· Mg(OH)2. As optional alkalizing agents, further inorganic alkalizing agents which are particularly preferred according to the invention and are solid at 20 °C and 1013 mbar are selected from alkaline earth metal silicates, alkaline earth metal metasilicates, alkali metal hydroxides, alkaline earth metal hydroxides, (alkali earth) metal phosphates and (alkali earth) metal hydrogen phosphates and mixtures of these substances.Particularly preferred inorganic alkalizing agents according to the invention which are solid at 20°C and 1013 mbar are mixtures of at least one sodium silicate or sodium metasilicate with a molar SiO2 / Na2O ratio of 0.9-1.1, preferably 1, and at least one magnesium hydroxide carbonate. Further particularly preferred inorganic alkalizing agents according to the invention which are solid at 20°C and 1013 mbar are mixtures of at least one sodium silicate or sodium metasilicate with a molar SiO2 / Na2O ratio of 0.9-1.1, preferably 1, at least one sodium silicate or sodium metasilicate with a molar SiO2 / Na2O ratio of 3.5, and at least one magnesium hydroxide carbonate. Oxidative hair lightening agents which are particularly preferred according to the invention contain, in each case based on their total weight, 0.1 to 20% by weight, preferably 1 to 15% by weight, particularly preferably 3 - 10% by weight.-% sodium silicates with a molar SiO2 / Na2O ratio of 0.9-1.1, preferably 1, and 0.1 to 40 wt.%, preferably 1 to 30 wt.%, particularly preferably 5-25 wt.% magnesium hydroxide carbonate as inorganic alkalizing agents that are solid at 20°C and 1013 mbar. Oxidative hair lightening agents preferred according to the invention are further characterized in that they do not contain any polymer that comprises acrylic acid, acrylic acid amides, acrylic acid esters, methacrylic acid, methacrylic acid amides, and / or methacrylic acid esters as chain-forming monomers. Such polymers can, in certain cases, adversely affect the heat development in the ready-to-use bleaching agent. For safety reasons, oxidative hair lightening agents packaged as bleaching powders should be formulated in such a way that they do not generate dust, or generate as little dust as possible, during use, especially before or while mixing with the liquid hydrogen peroxide solution.Suitable dust-reducing agents are, in particular, oils that are mixed with the dust-generating components of the bleaching powder, with the total amount of oils being 0.2–20% by weight, based on the weight of the oxidative hair lightening agent according to the invention, which is in the form of bleaching powder. If more than 20% by weight of oil is used, a paste forms with the anhydrous powdered components. Oxidative hair lightening agents according to the invention, which are in the form of bleaching paste, contain, based on their weight, at least one oil in a total amount of 20.1–80% by weight, preferably 35–65% by weight. By skillfully selecting the oils, the application properties of the oxidative hair lightening agent, as well as of the entire ready-to-use lightening agent, can be optimized.When selecting oils, the consumer's desire for products that contain as few synthetically produced ingredients as possible and instead consist of naturally obtained ingredients must also be taken into account. Oils of mineral origin, such as mineral oils and paraffins, have good application properties and are inexpensive. In the interests of sustainability of the entire product, oils from renewable raw material sources can be used instead of oils of mineral origin. Surprisingly, it has been found that certain oils can have a very favorable effect on the swelling behavior of the oxidative hair lightening agent according to the invention after mixing with an aqueous hydrogen peroxide preparation. Oxidative hair lightening agents preferred according to the invention contain, based on their weight, at least one oil in a total amount of 0.2 - 80 wt.%, preferably 1 - 70 wt.%, particularly preferably 4 - 60 wt.%, extraordinarily preferably 5 - 20 wt.-%. According to the invention, the at least one oil is preferably selected from mineral oils, branched fatty alcohols having 8-24 carbon atoms, dialkyl ethers having 6 to 18 carbon atoms in the alkyl groups, and mixtures of the aforementioned substances. Preferred branched fatty alcohols having 8-24 carbon atoms according to the invention are 2-octyl-1-dodecanol, 2-hexyl-1-decanol, 2-ethyl-1-hexanol, and isostearyl alcohol, as well as mixtures thereof. 2-octyl-1-dodecanol is particularly preferred. Dialkyl ethers having 6 to 18 C atoms in the alkyl groups which are preferred according to the invention are di-n-alkyl ethers having a total of 12 to 36 C atoms, in particular 16 to 24 C atoms in the molecule, such as, for example, di-n-octyl ether, di-n-decyl ether, di-n-nonyl ether, di-n-undecyl ether, di-n-dodecyl ether, di-n-octadecyl ether, n-hexyl-n-octyl ether, n-octyl-n-decyl ether, n-decyl-n-undecyl ether, n-undecyl-n-dodecyl ether and n-hexyl-n-undecyl ether.Likewise preferred dialkyl ethers are those with branched alkyl groups each having 6 to 18 carbon atoms, especially with alkyl groups substituted in the 2-position with an ethyl group. Preferred branched-chain dialkyl ethers with 6 to 18 carbon atoms in the alkyl group are selected from di-(2-ethylhexyl) ether and di-(2-ethyldecyl) ether. Particular preference is given to di-n-octyl ether (INCI: Dicaprylyl ether), which is sold commercially, for example, under the name Cetiol. ®OE is available from BASF. Preferred oxidative hair lightening agents according to the invention are characterized in that they contain, based on their weight, at least one oil selected from mineral oils, branched fatty alcohols having 8-24 carbon atoms, dialkyl ethers having 6 to 18 C atoms in the alkyl groups, and mixtures of the aforementioned substances, in a total amount of 0.2-80 wt.%, preferably 1-70 wt.%, particularly preferably 4-60 wt.%, extraordinarily preferably 5-20 wt.%. Oxidative hair lightening agents which are extraordinarily preferred according to the invention are characterized in that they contain, based on their weight, at least one oil selected from mineral oils, branched fatty alcohols having 8 - 24 carbon atoms, dialkyl ethers having 6 to 18 C atoms in the alkyl groups, and mixtures of the aforementioned substances, in a total amount of 0.2 - 10 wt.%, preferably 1 - 7 wt.%, particularly preferably 4 - 6 wt.-%, extraordinarily preferably 4.5 - 5.5 wt.%. Further oxidative hair lightening agents which are extraordinarily preferred according to the invention are characterized in that they contain, based on their weight, at least one oil selected from mineral oils and 2-octyl-1-dodecanol and mixtures of the aforementioned substances, in a total amount of 0.2 - 10 wt.%, preferably 1 - 7 wt.%, particularly preferably 4 - 6 wt.%, extraordinarily preferably 5 - 5.5 wt.%. Further oxidative hair lightening agents which are extraordinarily preferred according to the invention are characterized in that they contain, based on their weight, at least one oil selected from mineral oils and di-n-octyl ether and mixtures of the aforementioned substances, in a total amount of 0.2 - 10 wt.%, preferably 1 - 7 wt.%, particularly preferably 4 - 6 wt.%, extraordinarily preferably 5 - 5.5 wt.%. Silicone oils are also suitable oils according to the invention.Ester oils, for example benzoic acid esters of linear or branched C8-22 alkanols, such as benzoic acid C12-C15 alkyl esters, furthermore triglycerides (ie triple esters of glycerol) of linear or branched, saturated or unsaturated, optionally hydroxylated C8-30 fatty acids, preferably saturated triglyceride oils, in particular capric / caprylic triglycerides, as well as natural oils, e.g.Amaranth seed oil, apricot kernel oil, argan oil, avocado oil, babassu oil, cottonseed oil, borage seed oil, safflower oil, peanut oil, pomegranate seed oil, grapefruit seed oil, hemp oil, hazelnut oil, elderberry seed oil, blackcurrant seed oil, jojoba oil, linseed oil, macadamia nut oil, corn germ oil, almond oil, marula oil, evening primrose oil, olive oil, palm oil, palm kernel oil, Brazil nut oil, pecan nut oil, peach kernel oil, rapeseed oil, castor oil, sea buckthorn pulp oil, sea buckthorn kernel oil, sesame oil, soybean oil, sunflower oil, grapeseed oil, walnut oil, rosehip oil, wheat germ oil and the liquid parts of coconut oil, as well as the dicarboxylic acid esters of linear or branched C2-C. 10-Alkanols, such as diisopropyl adipate, di-n-butyl adipate, di-(2-ethylhexyl) adipate, dioctyl adipate, diethyl / di-n-butyl / dioctyl sebacate, diisopropyl sebacate, dioctyl malate, dioctyl maleate, dicaprylyl maleate, diisooctyl succinate, di-2-ethylhexyl succinate and di-(2-hexyldecyl) succinate, furthermore esters of linear or branched saturated or unsaturated fatty alcohols having 2 - 30 carbon atoms with linear or branched saturated or unsaturated fatty acids having 2 - 30 carbon atoms, which may be hydroxylated, which are preferably selected from 2-hexyldecyl stearate, 2-hexyldecyl laurate, isodecyl neopentanoate, isononyl isononanoate, 2-ethyl- hexyl palmitate and 2-ethylhexyl stearate, isopropyl myristate, isopropyl palmitate, isopropyl stearate, isopropyl isostearate, isopropyl oleate, isooctyl stearate, isononyl stearate, isocetyl stearate, isononyl isononanoate, isotridecyl isononanoate, cetearyl isononanoate, 2-Ethylhexyl laurate, 2-Ethylhexyl isostearate, 2-Ethylhexyl cocoate,2-Octyldodecyl palmitate, 2-butyloctanoic acid, diisotridecyl acetate, n-butyl stearate, n-hexyl laurate, n-decyl oleate, oleyl oleate, oleyl erucate, erucyl oleate, erucyl erucate, ethylene glycol dioleate and ethylene glycol dipalmitate, furthermore C8-C, 22-Fatty alcohol esters of monobasic or polybasic C2-C7 hydroxycarboxylic acids, in particular the esters of glycolic acid, lactic acid, malic acid, tartaric acid, citric acid and salicylic acid, e.g. C12-C15 alkyl lactate, furthermore the symmetrical, asymmetrical or cyclic esters of carbonic acid with C3-22 alkanols, C3-22 alkanediols or C3-22 alkanetriols, e.g. dicaprylyl carbonate, can also be used according to the invention as an oil, but are less preferred due to the possible risk of hydrolysis and should only be contained in small amounts of 0.1 to a maximum of 2% by weight, based on the oxidative hair lightening agent according to the invention.Furthermore, it was found that an alkali metal or alkaline earth metal salt of a C12-C24 monocarboxylic acid, which may be saturated or unsaturated, linear or branched, can very favorably influence the swelling behavior of the oxidative hair lightening agent according to the invention after mixing with an aqueous hydrogen peroxide preparation.Further oxidative hair lightening agents which are extraordinarily preferred according to the invention are therefore characterized in that they contain at least one alkali metal or alkaline earth metal salt of a C12-C24 monocarboxylic acid, which may be saturated or unsaturated, linear or branched, wherein the C12-C24 monocarboxylic acid is preferably selected from lauric acid, myristic acid, palmitic acid, palmitoleic acid, stearic acid, isostearic acid, oleic acid, elaidic acid, petroselinic acid, arachidic acid, gadoleic acid, behenic acid, erucic acid and brassidic acid and mixtures thereof, wherein stearic acid and palmitic acid and mixtures thereof are particularly preferred and wherein the potassium, magnesium and calcium salts of the C12-C24 monocarboxylic acid are extraordinarily preferred.In this context, potassium stearate, potassium palmitate, magnesium stearate, magnesium palmitate, calcium stearate, calcium palmitate, and mixtures of these substances are extremely preferred, with potassium stearate being particularly preferred. Further oxidative hair lightening agents that are extremely preferred according to the invention are therefore characterized in that they contain, in each case based on their weight, at least one alkali metal or alkaline earth metal salt of a C12-C24 monocarboxylic acid, which may be saturated or unsaturated, linear or branched, in a total amount of 0.05-1 wt.%, preferably 0.2-0.6 wt.%, particularly preferably 0.3-0.5 wt.%. Further oxidative hair lightening agents which are extraordinarily preferred according to the invention are therefore characterized in that they contain, in each case based on their weight, potassium stearate in a total amount of 0.05 - 1 wt.%, preferably 0.2 - 0.6 wt.%, particularly preferably 0.3 - 0.5 wt.%.Surprisingly, it was found that sodium hexametaphosphate can have a very favorable effect on the swelling behavior of the oxidative hair lightening agent according to the invention after mixing with an aqueous hydrogen peroxide preparation. Further oxidative hair lightening agents that are particularly preferred according to the invention are therefore characterized in that they contain, in each case based on their weight, 0.05–0.5% by weight, preferably 0.2–0.4% by weight, of sodium hexametaphosphate. Surprisingly, it was found that kaolin can have a very favorable effect on various application properties of the oxidative hair lightening agent according to the invention after mixing with an aqueous hydrogen peroxide preparation, including the foaming and swelling behavior, but also the drying behavior during the contact time. Kaolin ensures a creamy texture of the application mixture.In addition, kaolin on the hair promotes the rapid formation of a dry film on the application mixture. Further oxidative hair lightening agents that are particularly preferred according to the invention are therefore characterized in that they contain, based on their weight, 0.1–20% by weight, preferably 1–15% by weight, particularly preferably 6–10% by weight of kaolin.In a further preferred embodiment, the oxidative hair lightening agent according to the invention further contains at least one dicarboxylic acid having 2 to 10 carbon atoms, which is particularly preferably selected from succinic acid, oxalic acid, malonic acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, malic acid, D-tartaric acid, L-tartaric acid, meso-tartaric acid, grape acid, alpha-ketoglutaric acid, beta-ketoglutaric acid, oxaloacetic acid, maleic acid and fumaric acid and / or at least one salt of these acids and mixtures of these compounds, wherein the at least one dicarboxylic acid having 2 to 10 carbon atoms is extremely preferably selected from succinic acid, malic acid, malonic acid and maleic acid and salts thereof.Preferred salts of dicarboxylic acids having 2 to 10 carbon atoms according to the invention are selected from the mono- and disalts of the anions of succinic acid, oxalic acid, malonic acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, malic acid, D-tartaric acid, L-tartaric acid, meso-tartaric acid, grape acid, alpha-ketoglutaric acid, beta-ketoglutaric acid, oxaloacetic acid, maleic acid, and fumaric acid with alkali metal ions, alkaline earth metal ions, and the ions of basic amino acids, such as arginine, lysine, and histidine, in particular with lithium, sodium, potassium, magnesium, and calcium ions, as well as mixtures of these salts. The succinic acid, which is particularly preferred according to the invention, has a melting point in the range of 185–187°C at 1013 mbar, thus being a solid at 20°C.Salts of succinic acid suitable according to the invention are selected from the succinates and hydrogen succinates of alkali metal ions, alkaline earth metal ions, and the ions of basic amino acids, such as arginine, lysine, and histidine, in particular the lithium, sodium, potassium, magnesium, and calcium ions, or the succinates and hydrogen succinates of basic amino acids, such as arginine, lysine, and / or histidine, e.g., arginine succinate, as well as mixtures of these salts. The succinic acid salts mentioned may also contain bound water of crystallization, in particular sodium succinate hexahydrate, which is particularly preferred according to the invention. The malic acid particularly preferred according to the invention is optically active. For cost reasons, racemic DL-malic acid is preferred.Malic acid salts suitable according to the invention are selected from the malates and hydrogen malates of alkali metal ions, alkaline earth metal ions, and the ions of basic amino acids, such as arginine, lysine, and histidine, in particular lithium, sodium, potassium, magnesium, and calcium ions, as well as mixtures of these salts, in particular disodium malate and dipotassium malate, but also calcium malate. The malic acid salts suitable according to the invention may contain bound water of crystallization, in particular disodium malate hemihydrate and disodium malate trihydrate. Oxalic acid salts suitable according to the invention are selected from the oxalates and hydrogen oxalates of alkali metal ions, alkaline earth metal ions, and the ions of basic amino acids, such as arginine, lysine, and histidine, in particular lithium, sodium, potassium, magnesium, and calcium ions, as well as mixtures of these salts.Salts of the particularly preferred malonic acid suitable according to the invention are selected from the malates and hydrogen malates of alkali metal ions, alkaline earth metal ions, and the ions of basic amino acids, such as arginine, lysine, and histidine, in particular lithium, sodium, potassium, magnesium, and calcium ions, as well as mixtures of these salts. Salts of adipic acid suitable according to the invention are selected from the adipates and hydrogen adipates of alkali metal ions, alkaline earth metal ions, and the ions of basic amino acids, such as arginine, lysine, and histidine, in particular lithium, sodium, potassium, magnesium, and calcium ions, as well as mixtures of these salts.Salts of pimelic acid suitable according to the invention are selected from the pimelates and hydrogen pimelates of alkali metal ions, alkaline earth metal ions, and the ions of basic amino acids, such as arginine, lysine, and histidine, in particular lithium, sodium, potassium, magnesium, and calcium ions, as well as mixtures of these salts. Salts of suberic acid suitable according to the invention are selected from the suberates and hydrogen suberates of alkali metal ions, alkaline earth metal ions, and the ions of basic amino acids, such as arginine, lysine, and histidine, in particular lithium, sodium, potassium, magnesium, and calcium ions, as well as mixtures of these salts. Salts of azelaic acid suitable according to the invention are selected from the azelates and hydrogen azelates of alkali metal ions, alkaline earth metal ions and the ions of basic amino acids, such as arginine, lysine and histidine, in particular of lithium, sodium, potassium, magnesium and calcium ions, as well as mixtures of these salts.Salts of sebacic acid suitable according to the invention are selected from the sebacates and hydrogen sebacates of alkali metal ions, alkaline earth metal ions, and the ions of basic amino acids, such as arginine, lysine, and histidine, in particular lithium, sodium, potassium, magnesium, and calcium ions, as well as mixtures of these salts. Salts of the particularly preferred maleic acid suitable according to the invention are selected from the maleates and hydrogen maleates of alkali metal ions and alkaline earth metal ions, in particular lithium, sodium, potassium, magnesium, and calcium ions, as well as mixtures of these salts. Salts of the preferred fumaric acid suitable according to the invention are selected from the fumarates and hydrogen fumarates of alkali metal ions and alkaline earth metal ions, in particular lithium, sodium, potassium, magnesium, and calcium ions, as well as mixtures of these salts.Salts of the preferred D-tartaric acid suitable according to the invention are selected from the tartrates and hydrogen tartrates of alkali metal ions and alkaline earth metal ions, in particular lithium, sodium, potassium, magnesium, and calcium ions, as well as mixtures of these salts. Salts of the preferred L-tartaric acid suitable according to the invention are selected from the tartrates and hydrogen tartrates of alkali metal ions and alkaline earth metal ions, in particular lithium, sodium, potassium, magnesium, and calcium ions, as well as mixtures of these salts. Salts of the preferred meso-tartaric acid suitable according to the invention are selected from the tartrates and hydrogen tartrates of alkali metal ions and alkaline earth metal ions, in particular lithium, sodium, potassium, magnesium, and calcium ions, as well as mixtures of these salts. The particularly preferred grape acid according to the invention is the racemic mixture of D-tartaric acid and L-tartaric acid.Suitable salts of tartaric acid according to the invention are selected from the tartrates and hydrogen tartrates of alkali metal ions and alkaline earth metal ions, in particular lithium, sodium, potassium, magnesium, and calcium ions, as well as mixtures of these salts. Suitable salts of alpha-ketoglutaric acid according to the invention are selected from the alpha-ketoglutarates and alpha-ketohydrogen glutarates of alkali metal ions and alkaline earth metal ions, in particular lithium, sodium, potassium, magnesium, and calcium ions, as well as mixtures of these salts. Suitable salts of beta-ketoglutaric acid according to the invention are selected from the beta-ketoglutarates and beta-ketohydrogen glutarates of alkali metal ions and alkaline earth metal ions, in particular lithium, sodium, potassium, magnesium, and calcium ions, as well as mixtures of these salts.Salts of oxaloacetic acid suitable according to the invention are selected from the oxaloacetates and oxalohydroacetates of alkali metal ions and alkaline earth metal ions, in particular of lithium, sodium, potassium, magnesium and calcium ions, as well as mixtures of these salts. Oxidative hair lightening agents preferred according to the invention contain at least one dicarboxylic acid having 2 to 10 carbon atoms, which is preferably selected from succinic acid, oxalic acid, malonic acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, malic acid, D-tartaric acid, L-tartaric acid, meso-tartaric acid, grape acid, alpha-ketoglutaric acid, beta-ketoglutaric acid, oxaloacetic acid, maleic acid and fumaric acid and / or at least one salt of these acids, in a total amount, converted to the mass of free dicarboxylic acid, of 0.2 to 4.0 wt.%, preferably 0.33 to 3.0 wt.%, particularly preferably 0.4 to 2.0 wt.%, extraordinarily preferably 0.5 - 1.0 wt.-%, each based on the weight of the oxidative hair lightening agent. Further oxidative hair lightening agents preferred according to the invention contain succinic acid and / or at least one salt of succinic acid in a total amount, converted to the mass of free dicarboxylic acid, of 0.2 to 4.0 wt.%, preferably 0.33 to 3.0 wt.%, particularly preferably 0.4 to 2.0 wt.%, extraordinarily preferably 0.5-1.0 wt.%, each based on the weight of the oxidative hair lightening agent. Further oxidative hair lightening agents preferred according to the invention contain malic acid and / or at least one salt of malic acid in a total amount, converted to the mass of free dicarboxylic acid, of 0.2 to 4.0 wt.%, preferably 0.33 to 3.0 wt.%, particularly preferably 0.4 to 2.0 wt.%, extraordinarily preferably 0.5 - 1.0 wt.%, in each case based on the weight of the oxidative hair lightening agent.Further oxidative hair lightening agents preferred according to the invention contain malonic acid and / or at least one salt of malonic acid in a total amount, converted to the mass of free dicarboxylic acid, of 0.2 to 4.0 wt.%, preferably 0.33 to 3.0 wt.%, particularly preferably 0.4 to 2.0 wt.%, extraordinarily preferably 0.5-1.0 wt.%, in each case based on the weight of the oxidative hair lightening agent. Oxidative hair lightening agents particularly preferred according to the invention further contain at least one or more hydrophilic thickeners, which are preferably selected from polysaccharides that may be chemically and / or physically modified. Compounds from the group of polysaccharides are particularly preferred as hydrophilic thickeners according to the invention, since the basic structures of the polysaccharides are of natural origin and biodegradable.Preferred hydrophilic polysaccharide thickeners are selected from celluloses, cellulose ethers of C1-C4 alcohols, cellulose esters, xanthan gum, guar gum, alginic acids (and their corresponding physiologically acceptable salts, the alginates), agar agar (with the polysaccharide agarose present in agar agar as the main component), starch fractions and starch derivatives such as amylose, amylopectin and dextrins, karaya gum, locust bean gum, gum arabic, pectins, dextrans and mixtures thereof. Cellulose ethers of C1-C4 alcohols and cellulose esters preferred according to the invention are selected from methylcelluloses, ethylcelluloses, hydroxyalkylcelluloses (such as hydroxyethylcellulose), methylhydroxyalkylcelluloses and carboxymethylcelluloses (such as sodium carboxymethylcellulose, whose INCI name is Cellulose Gum) and their physiologically acceptable salts.In preferred embodiments, sodium carboxymethylcellulose (preferably sodium carboxymethylcellulose with the INCI name Cellulose Gum) is included as a hydrophilic thickener to ensure reliable viscosity adjustment and residue-free application to keratin fibers, with contact with the scalp being avoided as much as possible. In a preferred embodiment, sodium carboxymethylcellulose can be included as the sole hydrophilic thickener. Combinations of sodium carboxymethylcellulose and xanthan gum (preferably xanthan gum with the INCI name Xanthan Gum) are particularly preferred. Combinations of xanthan gum, sodium carboxymethylcellulose, and guar gum with the INCI name Cyamopsis Tetragonoloba Gum are extremely preferred.Particularly preferred oxidative hair lightening agents according to the invention contain at least one hydrophilic thickener, which is preferably selected from polysaccharides that may be chemically and / or physically modified, in a total amount of 0.1 to 5 wt.%, preferably 0.5 to 4 wt.%, more preferably 1 to 3.5 wt.%, and most preferably 2.5 to 3.4 wt.%, in each case based on the weight of the oxidative hair lightening agent. In a further preferred embodiment of the present invention, the oxidative hair lightening agent according to the invention contains, in each case based on its weight, 0.01 to 0.5 wt.%, preferably 0.05 to 0.1 wt.%, of sodium carboxymethylcellulose. In a further preferred embodiment of the present invention, the oxidative hair lightening agent according to the invention contains, in each case based on its weight, 0.1 to 3 wt.%, preferably 0.2 to 1.0 wt.%, more preferably 0.25 to 0.5 wt.%, of hydroxyethylcellulose.Furthermore, the oxidative hair lightening agents according to the invention or preferred according to the invention can contain at least one direct dye. These are dyes that are absorbed directly into the hair and do not require an oxidative process to develop the color. To dull undesirable residual color impressions caused by melanin degradation products, particularly in the reddish or bluish range, certain direct dyes of complementary colors are particularly preferably included. Direct dyes are typically nitrophenylenediamines, nitroaminophenols, azo dyes, anthraquinones, or indophenols. Direct dyes can be anionic, cationic, or nonionic. The direct dyes are each preferably present in an amount of 0.001 to 2% by weight, based on the weight of the oxidative hair lightening agent.Preferred anionic direct dyes are the compounds known under the international names or trade names Acid Yellow 1, Yellow 10, Acid Yellow 23, Acid Yellow 36, Acid Orange 7, Acid Red 33, Acid Red 52, Pigment Red 57:1, Acid Blue 7, Acid Green 50, Acid Violet 43, Acid Black 1, Acid Black 52, Bromophenol Blue and Tetrabromophenol Blue. Preferred cationic direct dyes are cationic triphenylmethane dyes, for example Basic Blue 7, Basic Blue 26, Basic Violet 2 and Basic Violet 14, aromatic systems substituted with a quaternary nitrogen group, such as Basic Yellow 57, Basic Red 76, Basic Blue 99, Basic Brown 16 and Basic Brown 17, cationic anthraquinone dyes, such as HC Blue 16 (Bluequat B) and direct dyes containing a heterocycle having at least one quaternary nitrogen atom, in particular Basic Yellow 87, Basic Orange 31 and Basic Red 51.The cationic direct dyes marketed under the trademark Arianor are also preferred cationic direct dyes according to the invention. Particularly suitable nonionic direct dyes are nonionic nitro and quinone dyes and neutral azo dyes. Preferred nonionic direct dyes are those known under the international designations "Arianor" and "Arianor" respectively.Handelsnamen HC Yellow 2, HC Yellow 4, HC Yellow 5, HC Yellow 6, HC Yellow 12, HC Orange 1, Disperse Orange 3, HC Red 1, HC Red 3, HC Red 10, HC Red 11, HC Red 13, HC Red BN, HC Blue 2, HC Blue 11, HC Blue 12, Disperse Blue 3, HC Violet 1, Disperse Violet 1, Disperse Violet 4, Disperse Black 9 bekannten Verbindun- gen, sowie 1,4-Diamino-2-nitrobenzol, 2-Amino-4-nitrophenol, 1,4-Bis-(2-hydroxyethyl)-amino-2-nitro- benzol, 3-Nitro-4-(2-hydroxyethyl)aminophenol, 2-(2-Hydroxyethyl)amino-4,6-dinitrophenol, 4-[(2-Hydroxy- ethyl)amino]-3-nitro-1-methylbenzol, 1-Amino-4-(2-hydroxyethyl)amino-5-chlor-2-nitrobenzol, 4-Amino-3- nitrophenol, 1-(2'-Ureidoethyl)amino-4-nitrobenzol, 2-[(4-Amino-2-nitrophenyl)amino]-benzoesäure, 6- Nitro-1,2,3,4-tetrahydrochinoxalin, 2-Hydroxy-1,4-naphthochinon, Pikraminsäure und deren Salze, 2-Amino-6-chloro-4-nitrophenol, 4-Ethylamino-3-nitrobenzoesäure und 2-Chlor-6-ethylamino-4-nitro- phenol.According to the invention, a combination of tetrabromophenol blue and Acid Red 92 is very particularly preferably included. The present invention further provides a process for lightening or lightening hair coloring, in which an oxidative hair lightening agent (B) according to the invention or preferred according to the invention is mixed with an oxidation composition (Ox) which, in each case based on its weight, 50 - 96 wt.%, preferably 70 - 93 wt.%, particularly preferably 80 - 90 wt.%, water and 0.5 - 20 wt.-% hydrogen peroxide and further contains at least one pH adjuster in such an amount that the oxidation composition has a pH in the range of 1.5 to 5.5, measured at 20°C, immediately thereafter applied to the keratin-containing fibers, left on the fibers for 5 to 60 minutes and then the fibers are rinsed with water and optionally washed out with a surfactant-containing cleaning agent, wherein the oxidative hair lightening agent (B) and the oxidation composition (Ox) are preferably mixed with one another in a weight-related ratio (B):(Ox) of 0.2 - 2, particularly preferably 0.3 - 1.5, further preferably 0.5 - 1. The oxidation composition (Ox) used in the lightening process according to the invention essentially contains water and hydrogen peroxide. The concentration of the hydrogen peroxide is determined on the one hand by legal requirements and on the other hand by the desired effect. It is 0.5 - 20 wt.-%, preferably 3-12 wt.%, particularly preferably 6-9 wt.% hydrogen peroxide (calculated as 100% H2O2), in each case based on the weight of the oxidation composition (Ox). To stabilize the hydrogen peroxide, the oxidation composition (Ox) preferably has an acidic pH, in particular a pH in the range of 1.5 to 5.5, measured at 20°C. Complexing agents, preservatives, stabilizers, and / or buffer substances are also preferably included to stabilize the hydrogen peroxide. According to the invention, the oxidative hair lightening agent (B) is preferably composed such that the mixture with the aforementioned oxidation composition (Ox), i.e. the ready-to-use lightening agent, in particular bleaching agent, has an alkaline pH, preferably a pH of 8.0 to 11.5, preferably in the range of 8.5 to 11.0, particularly preferably 9.0 - 10.5, extremely preferably 9.5 - 10.0, in each case measured at 20 °C.Oxidation compositions (Ox) which are particularly preferably used according to the invention further contain at least one oil and / or at least one fatty component with a melting point in the range of 23 - 110 °C, preferably in a total amount of 0.1 - 60 wt. %, particularly preferably 0.5 - 40 wt. %, extraordinarily preferably 2 - 24 wt. %, in each case based on the weight of the oxidation composition (Ox) which is preferably used according to the invention. The oils suitable for the oxidation compositions (Ox) which are preferably used according to the invention are largely the same oils which are disclosed above as suitable dedusting agents for bleaching powders and as carrier oils for bleaching pastes. Fatty components which are preferably used according to the invention in the oxidation compositions (Ox) and have a melting point in the range of 23 - 110 °C are selected from linear saturated 1-alkanols having 12 - 30 carbon atoms, preferably in a total amount of 0.1 - 8 wt.-%, particularly preferably 3.0 to 6.0 wt.%, in each case based on the weight of the oxidation composition (Ox) used according to the invention. Preferably, the at least one linear saturated 1-alkanol having 12-30 carbon atoms is selected from lauryl alcohol, myristyl alcohol, cetyl alcohol, stearyl alcohol, arachidyl alcohol, and behenyl alcohol, as well as from mixtures of these 1-alkanols, particularly preferably from cetyl alcohol, stearyl alcohol, and cetyl alcohol / stearyl alcohol mixtures. Oxidation compositions (Ox) preferably used according to the invention further comprise, in each case based on their weight, at least one linear saturated 1-alkanol having 12 - 30 carbon atoms in a total amount of 0.1 - 8 wt.%, preferably in a total amount of 2 - 6 wt.%, wherein at least one 1-alkanol selected from cetyl alcohol, stearyl alcohol and cetyl alcohol / stearyl alcohol mixtures is present.Further oxidation compositions (Ox) preferably used according to the invention contain at least one fatty component with a melting point in the range of 23 - 110 °C, which is selected from esters of a saturated, monovalent C. 16 -C 60 -alkanol and a saturated C8-C 36Monocarboxylic acid, in particular cetyl behenate, stearyl behenate, and C20-C40 alkyl stearate, glycerol triesters of saturated linear C12-C30 carboxylic acids, which may be hydroxylated, candelilla wax, carnauba wax, beeswax, saturated linear C14-C36 carboxylic acids, and mixtures of the aforementioned substances. Further oxidation compositions (Ox) preferably used according to the invention contain at least one surfactant or at least one emulsifier, preferably in a total amount of 0.5-10% by weight, preferably 1-5% by weight, each based on the weight of the oxidation composition (Ox) used according to the invention. Surfactants and emulsifiers within the meaning of the present application are amphiphilic (bifunctional) compounds consisting of at least one hydrophobic and at least one hydrophilic molecular moiety. The hydrophobic residue is preferably a hydrocarbon chain with 8-28 carbon atoms, which can be saturated or unsaturated, linear or branched.This C8-C28 alkyl chain is particularly preferably linear. Basic properties of surfactants and emulsifiers are oriented absorption at interfaces, as well as aggregation into micelles and the formation of lyotropic phases. According to the invention, anionic, nonionic, and cationic surfactants are particularly suitable. However, zwitterionic and amphoteric surfactants are also very suitable. Suitable anionic surfactants in the compositions according to the invention are all anionic surface-active substances suitable for use on the human body. These are characterized by a water-solubilizing, anionic group such as a carboxylate, sulfate, sulfonate, or phosphate group and a lipophilic alkyl group with 8 to 30 carbon atoms. In addition, the molecule can contain glycol or polyglycol ether groups, ester, ether, and amide groups, as well as hydroxyl groups.Examples of suitable anionic surfactants are linear and branched fatty acids with 8 to 30 carbon atoms (soaps), alkyl ether carboxylic acids, acyl sarcosides, acyl taurides, acyl isethionates, sulfosuccinic acid mono- and dialkyl esters and sulfosuccinic acid monoalkylpolyoxyethyl esters, linear alkanesulfonates, linear alpha-olefin sulfonates, alkyl sulfates and alkyl ether sulfates, as well as alkyl and / or alkenyl phosphates. Preferred anionic surfactants are alkyl sulfates, alkyl ether sulfates, and alkyl ether carboxylic acids, each containing 10 to 18 carbon atoms, preferably 12 to 14 carbon atoms in the alkyl group, and up to 12 glycol ether groups, preferably 2 to 6 glycol ether groups, in the molecule. Examples of such surfactants are the compounds with the INCI names Sodium Laureth Sulfate, Sodium Lauryl Sulfate, Sodium Myreth Sulfate or Sodium Laureth Carboxylate.Zwitterionic surfactants are surface-active compounds that contain at least one quaternary ammonium group and at least one carboxylate, sulfonate, or sulfate group in the molecule. Particularly suitable zwitterionic surfactants are the so-called betaines, such as N-alkyl-N,N-dimethylammonium glycinates, for example, cocoalkyl dimethylammonium glycinate; N-acyl-aminopropyl-N,N-dimethylammonium glycinates, for example, cocoacylaminopropyl dimethylammonium glycinate; and 2-alkyl-3-carboxymethyl-3-hydroxyethyl-imidazolines, each with 8 to 18 carbon atoms in the alkyl or acyl group, as well as cocoacylaminoethyl hydroxyethylcarboxymethylglycinate. A preferred zwitterionic surfactant is the fatty acid amide derivative known by the INCI name Cocamidopropyl Betaine.Amphoteric surfactants are surface-active compounds which, in addition to a C8-C24 alkyl or acyl group in the molecule, contain at least one free amino group and at least one -COOH- or -SO3H group and are capable of forming inner salts. Examples of suitable amphoteric surfactants are N-alkylglycines, N-alkylpropionic acids, N-alkylaminobutyric acids, N-alkyliminodipropionic acids, N-hydroxyethyl-N-alkylamidopropylglycine, N-alkyltaurines, N-alkylsarcosines, 2-alkylaminopropionic acids and alkylaminoacetic acids, each with 8 to 24 C atoms in the alkyl group. Particularly preferred amphoteric surfactants are N-cocoalkylaminopropionate, cocoacylaminoethylaminopropionate and C12-C18 acylsarcosine. Non-ionic surfactants contain, for example, as a hydrophilic group. B. a polyol group, a polyalkylene glycol ether group or a combination of polyol and polyglycol ether group.Such compounds are, for example, addition products of 4 to 50 mol of ethylene oxide and / or 0 to 5 mol of propylene oxide with linear and branched fatty alcohols, with fatty acids and with alkylphenols, each with 8 to 20 C atoms in the alkyl group, ethoxylated mono-, di- and triglycerides, such as, for example, glycerol monolaurate + 20 ethylene oxide, and glycerol monostearate + 20 ethylene oxide, sorbitan fatty acid esters and addition products of ethylene oxide with sorbitan fatty acid esters such as, for example, the polysorbates (Tween 20, Tween 21, Tween 60, Tween 61, Tween 81), addition products of ethylene oxide with fatty acid alkanolamides and fatty amines, as well as alkyl polyglycosides. Particularly suitable non-ionic surfactants are C8-C22 alkyl mono- and oligoglycosides and their ethoxylated analogues as well as ethylene oxide addition products with saturated or unsaturated linear fatty alcohols, each containing 2 to 30 moles of ethylene oxide per mole of fatty alcohol.Further oxidation compositions preferably used according to the invention are characterized in that the at least one anionic surfactant is selected from alkyl sulfates, alkyl ether sulfates and alkyl ether carboxylic acids each having 10 to 18 C atoms, preferably 12 to 14 C atoms in the alkyl group and up to 12, preferably 2 to 6 glycol ether groups, in the molecule.Further oxidation compositions preferably used according to the invention are characterized in that they contain at least one non-ionic surfactant selected from ethylene oxide addition products onto saturated or unsaturated linear fatty alcohols, each containing 2 to 30 moles of ethylene oxide per mole of fatty alcohol, and at least one anionic surfactant selected from alkyl sulfates, alkyl ether sulfates and alkyl ether carboxylic acids, each containing 10 to 18 carbon atoms, preferably 12 to 14 carbon atoms in the alkyl group and up to 12, preferably 2 to 6 glycol ether groups, in the molecule, wherein the weight ratio of the total of all anionic surfactants to the total of all non-ionic surfactants is particularly preferably in the range of 5 - 50, preferably 10 - 30. In principle, all cationic surface-active substances suitable for use on the human body are suitable as cationic surfactants in the oxidation compositions (Ox) preferably used according to the invention.These are characterized by at least one water-solubilizing, cationic group, such as a quaternary ammonium group, or by at least one water-solubilizing, cationizable group, such as an amine group, and furthermore at least one (lipophilic) alkyl group having 6 to 30 carbon atoms or at least one (lipophilic) imidazole group or at least one (lipophilic) imidazole alkyl group. Oxidation compositions (Ox) used particularly preferably according to the invention contain at least one cationic surfactant, which is preferably selected from quaternary ammonium compounds having at least one C8-C24 alkyl radical, esterquats and amidoamines, each having at least one C8-C24 acyl radical, and mixtures thereof.Preferred quaternary ammonium compounds with at least one C8-C24 alkyl radical are ammonium halides, especially chlorides, and ammonium alkyl sulfates, such as methosulfates or ethosulfates, such as C8-C24 alkyltrimethylammonium chlorides, C8-C24 dialkyldimethylammonium chlorides, and C8-C24 trialkylmethylammonium chlorides, e.g., cetyltrimethylammonium chloride, stearyltrimethylammonium chloride, distearyldimethylammonium chloride, lauryldimethylammonium chloride, lauryldimethylbenzylammonium chloride, and tricetylmethylammonium chloride, as well as the imidazolium compounds known under the INCI names Quaternium-27, Quaternium-83, Quaternium-87, and Quaternium-91. The alkyl chains of the above-mentioned surfactants preferably have 8 to 24 carbon atoms. Esterquats are cationic surfactants that contain at least one ester function as well as at least one quaternary ammonium group as a structural element and furthermore at least one C8-C24 alkyl radical or C8-C24 acyl radical.Preferred esterquats are quaternized ester salts of fatty acids with triethanolamine, quaternized ester salts of fatty acids with diethanolalkylamines, and quaternized ester salts of fatty acids with 1,2-dihydroxypropyldialkylamines. N,N-bis(2-palmitoyloxyethyl)dimethylammonium chloride, distearoylethyl dimonium methosulfate, and distearoylethyl hydroxyethylmonium methosulfate are preferred examples of such esterquats. The alkylamidoamines are typically prepared by amidation of natural or synthetic C8-C24 fatty acids and fatty acid cuts with di-(C1-C3)alkylaminoamines. A particularly suitable compound from this group of substances according to the invention is stearamidopropyldimethylamine. Oxidation compositions (Ox) which are particularly preferably used according to the invention contain at least one cationic surfactant in a total amount of 0.01 - 5 wt.%, preferably 0.1 - 3 wt.%, particularly preferably 0.3 - 2 wt.-%, in each case based on the weight of the oxidation composition (Ox) used according to the invention. A further subject of the present invention is a multi-component packaging unit (kit of parts) for lightening keratin fibers, which contains at least two separately packaged components and which is characterized in that i) the first component (B) is an oxidative hair lightening agent according to the invention or an oxidative hair lightening agent preferred according to the invention, ii) the second component (Ox) is an oxidation composition which, in each case based on its weight, 50 - 96 wt.%, preferably 70 - 93 wt.%, particularly preferably 80 - 90 wt.%, water and 0.5 - 20 wt.-% hydrogen peroxide and has a pH in the range from 1.5 to 5.5, measured at 20°C, wherein components (B) and (Ox) are preferably present in a weight-related ratio (B):(Ox) of 0.2 - 2, particularly preferably 0.3 - 1.5, further preferably 0.5 - 1, extremely preferably 0.5 - 0.6. The ready-to-use mixtures of an oxidative hair lightening agent according to the invention or preferred according to the invention with one of the aforementioned oxidation compositions (Ox) preferably have a viscosity in the range from 15,000 to 100,000 mPas, particularly preferably 20,000 to 85,000 mPas, in each case measured at 20°C using a Brookfield viscometer type DV-II+, spindle 5 at a speed of 4 revolutions / minute.A viscosity in this range allows the ready-to-use agent to be easily applied and, on the other hand, to have such flow properties that it guarantees a sufficiently long exposure time for the agent at the site of action on the keratin fibers. A multi-component packaging unit comprises several individual components that are packaged separately from one another, as well as common packaging for these components, for example a folding box. In this box, the components are each provided separately in different containers. In the context of the present invention, a container is understood to mean a packaging in the form of a possibly resealable bottle, a tube, a can, a bag, a sachet or a similar packaging. According to the invention, there are no limits to the packaging material. However, the packaging is preferably made of glass or plastic.In addition, the packaging unit can include application aids such as combs, brushes or paintbrushes, personal protective clothing, in particular disposable gloves, and instructions for use. The exposure time is preferably 5 to 60 minutes, in particular 5 to 50 minutes, particularly preferably 10 to 45 minutes. During the exposure time of the agents on the fiber, it can be advantageous to support the lightening process by applying heat. A exposure phase at room temperature is also according to the invention. In particular, the temperature during the exposure time is between 20°C and 40°C, in particular between 25°C and 38°C. The agents produce good treatment results even at physiologically acceptable temperatures below 45°C. After the lightening process is complete, all components present on the keratin fibers are rinsed out of the hair with water or a surfactant-containing cleaning agent.Commercially available shampoo can be used in particular as the cleaning agent, although the cleaning agent can be dispensed with and the rinsing process can be carried out with tap water if the lightening agent has a higher surfactant content. What has been said about the oxidative hair lightening agents according to the invention and those preferred according to the invention also applies mutatis mutandis to the multi-component packaging units (kits of parts) according to the invention and those preferred according to the invention. What has been said about the oxidative hair lightening agents according to the invention and those preferred according to the invention also applies mutatis mutandis to the methods for lightening keratin fibers according to the invention and those preferred according to the invention. What has been said about the oxidation compositions used in accordance with the invention and those preferred according to the invention also applies mutatis mutandis to the multi-component packaging units (kits of parts) according to the invention and those preferred according to the invention.What has been said regarding the oxidation compositions used in accordance with the invention and those used with preference according to the invention also applies mutatis mutandis to the methods for lightening keratin fibers according to the invention and those preferred according to the invention. What has been said regarding the oxidative hair lightening agents according to the invention and those preferred according to the invention also applies mutatis mutandis to the use according to the invention. What has been said regarding the oxidation compositions used in accordance with the invention and those used with preference according to the invention also applies mutatis mutandis to the use according to the invention. In summary, the subject matter of the invention is described by the following points: 1.Oxidative hair lightening agent for lightening or lightening the hair, comprising a) at least one oxidizing agent selected from the inorganic salts of a peroxosulfuric acid, and mixtures of these salts, b) furthermore at least one complexing agent selected from complexing agents of the general formula (I), wherein R1 represents a hydrogen atom, a C1-C6-alkyl group, a hydroxy-C2-C6-alkyl group, a carboxy-C1-C6-alkyl group or a physiologically acceptable salt thereof, R2, R3 independently of one another represent a hydrogen atom, a C1-C6-alkyl group, a hydroxy-C2-C6-alkyl group, a carboxy-C1-C6-alkyl group or a physiologically acceptable salt thereof, wherein R2 and R3 do not simultaneously represent a hydrogen atom and not simultaneously represent a carboxy-C1-C6-alkyl group, M1, M2 independently of one another represent a hydrogen atom or a Alkali metal ion, preferably sodium, potassium, or an ammonium ion (NH4.+), and c) at least one salt selected from ammonium chloride and potassium chloride, and mixtures thereof, d) and 0 to 10 wt.%, preferably 0.1 to 8 wt.%, particularly preferably 0.5 to 5 wt.% of water, in each case based on the weight of the oxidative hair lightening agent. Oxidative hair lightening agent according to item 1, characterized in that the at least one oxidizing agent a) is present in a total amount of 5-85 wt.%, preferably 10-70 wt.%, particularly preferably 17-55 wt.%, extremely preferably 22-45 wt.%, in each case based on the weight of the oxidative hair lightening agent.Oxidative hair lightening agent according to point 1 or 2, characterized in that the at least one oxidizing agent a) is selected from sodium peroxodisulfate, potassium peroxodisulfate, ammonium peroxodisulfate, sodium peroxomonosulfate, potassium peroxomonosulfate, ammonium peroxomonosulfate and mixtures of these compounds, preferably potassium peroxodisulfate-ammonium peroxodisulfate mixtures, potassium peroxodisulfate-ammonium peroxodisulfate-sodium peroxodisulfate mixtures and potassium peroxodisulfate-sodium peroxodisulfate mixtures, particularly preferably from potassium peroxodisulfate-ammonium peroxodisulfate mixtures, extraordinarily preferably from potassium peroxodisulfate-ammonium peroxodisulfate mixtures with an excess of potassium peroxodisulfate, which are free of sodium peroxodisulfate.Oxidative hair lightening agent according to any one of points 1-3, characterized in that the at least one complexing agent b) of the general formula (I) is selected from methylglycinediacetic acid, the sodium salts, potassium salts, and ammonium salts of methylglycinediacetic acid, and mixtures of the aforementioned substances, with the disodium salt and the trisodium salt of methylglycinediacetic acid being preferred, and the trisodium salt of methylglycinediacetic acid being particularly preferred. Oxidative hair lightening agent according to any one of points 1-4, characterized in that the at least one complexing agent b) is present in a total amount of 0.1 to 5.0 wt.%, preferably 0.2 to 2.0 wt.%, particularly preferably 0.4 to 1.6 wt.%, extraordinarily preferably 0.5-1.0 wt.%, in each case based on the weight of the oxidative hair lightening agent.Oxidative hair lightening agent according to any one of points 1-5, characterized in that the trisodium salt of methylglycinediacetic acid is present in an amount of 0.1 to 5.0 wt.%, preferably 0.2 to 2.0 wt.%, particularly preferably 0.4 to 1.6 wt.%, extremely preferably 0.5-1.0 wt.%, in each case based on the weight of the oxidative hair lightening agent. Oxidative hair lightening agent according to any one of points 1-6, characterized in that the ammonium chloride c) is present in an amount of 0.1 to 10.0 wt.%, preferably 1.0 to 8.0 wt.%, particularly preferably 2.0 to 6.0 wt.%, extremely preferably 3.1-5.0 wt.%, in each case based on the weight of the oxidative hair lightening agent. Oxidative hair lightening agent according to one of points 1 - 7, characterized in that the potassium chloride c) is present in an amount of 0.1 to 10.0 wt.%, preferably 1.0 to 8.0 wt.%, particularly preferably 2.0 to 6.0 wt.-%, extremely preferably from 3.1 - 5.0 wt.%, in each case based on the weight of the oxidative hair lightening agent. Oxidative hair lightening agent according to one of points 1 - 8, characterized in that at least one inorganic alkalizing agent which is solid at 20 °C and 1013 mbar is contained, including in a total amount of 0.1 to 40 wt.%, preferably 1 to 30 wt.%, particularly preferably 5 - 25 wt.%, in each case based on the weight of the oxidative hair lightening agent, at least one magnesium hydroxide carbonate, which is preferably selected from magnesium hydroxide carbonates with the formula MgCO3·Mg(OH)2·2 H2O and magnesium hydroxide carbonates with the formula MgCO3·Mg(OH)2. Oxidative hair lightening agent according to any one of items 1-9, characterized in that at least one alpha-amino acid or beta-amino acid and / or its salt is contained.Oxidative hair lightening agent according to any one of points 1-10, characterized in that the at least one alpha-amino acid or beta-amino acid and / or its salt is present in a total amount, converted to the mass of free amino acid, of 0.1 to 3.0 wt.%, preferably 0.2 to 1.5 wt.%, particularly preferably 0.3 to 0.6 wt.%, extraordinarily preferably 0.4-0.5 wt.%, in each case based on the weight of the oxidative hair lightening agent. Oxidative hair lightening agent according to any one of points 1-11, characterized in that the at least one alpha-amino acid is selected from serine, arginine, the salts of these amino acids, and mixtures of the aforementioned substances, with mixtures of serine and arginine being particularly preferred.Oxidative hair lightening agent according to one of points 1 - 12, characterized in that at least one alpha-amino acid selected from L-arginine, L-serine or at least one salt of these amino acids is contained in a total amount, converted to the mass of free amino acid, of 0.1 to 3.0 wt.%, preferably 0.2 to 1.5 wt.%, particularly preferably 0.3 to 0.6 wt.%, extraordinarily preferably 0.4 - 0.5 wt.%, in each case based on the weight of the oxidative hair lightening agent. Oxidative hair lightening agent according to one of points 1 - 13, characterized in that polyquaternium-4 is contained in a total amount of 0.01 to 3.0 wt.%, preferably 0.1 to 1.0 wt.%, particularly preferably 0.1 to 0.7 wt.%, extraordinarily preferably 0.3 - 0.5 wt.%, in each case based on the weight of the oxidative hair lightening agent.Oxidative hair lightening agent according to one of points 1 - 14, characterized in that at least one alkali metal or alkaline earth metal salt of a C12-C24 monocarboxylic acid, which can be saturated or unsaturated, linear or branched, is contained, wherein the C12-C24 monocarboxylic acid is preferably selected from lauric acid, myristic acid, palmitic acid, palmitoleic acid, stearic acid, isostearic acid, oleic acid, elaidic acid, petroselinic acid, arachidic acid, gadoleic acid, behenic acid, erucic acid and brassidic acid and mixtures thereof, wherein stearic acid and palmitic acid and mixtures thereof are particularly preferred and wherein the potassium, magnesium and calcium salts of the C12-C24 monocarboxylic acid are extremely preferred.The oxidative hair lightening agent according to any one of items 1-15, characterized in that, based on its weight, at least one alkali metal or alkaline earth metal salt of a C12-C24 monocarboxylic acid, which may be saturated or unsaturated, linear or branched, is present in a total amount of 0.05-1 wt.%, preferably 0.2-0.6 wt.%, particularly preferably 0.3-0.5 wt.%. The oxidative hair lightening agent according to any one of items 1-16, characterized in that 0.05-0.5 wt.%, preferably 0.2-0.4 wt.%, of sodium hexametaphosphate is present, based on the weight of the oxidative hair lightening agent.Oxidative hair lightening agent according to one of points 1 - 17, characterized in that it further contains at least one dicarboxylic acid having 2 to 10 carbon atoms, selected from succinic acid, oxalic acid, malonic acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, malic acid, D-tartaric acid, L-tartaric acid, meso-tartaric acid, grape acid, alpha-ketoglutaric acid, beta-ketoglutaric acid, oxaloacetic acid, maleic acid and fumaric acid, the salts of the aforementioned acids and mixtures of the aforementioned substances, wherein preferably the at least one dicarboxylic acid having 2 to 10 carbon atoms and / or its salt(s) in a total amount of 0.2 to 4.0 wt.%, preferably 0.33 to 3.0 wt.%, particularly preferably 0.5 to 2.0 wt.%, extraordinarily preferably 0.7 - 1.0 % by weight, each converted to the undissociated acid and based on the weight of the oxidative hair lightening agent.The oxidative hair lightening agent according to any one of items 1-18, characterized in that it contains at least one inorganic alkalizing agent that is solid at 20°C and 1013 mbar in a total amount of 4-70 wt.%, preferably 10-60 wt.%, particularly preferably 15-50 wt.%, further particularly preferably 20-55 wt.%, extraordinarily preferably 30-40 wt.%, in each case based on the weight of the oxidative hair lightening agent. The oxidative hair lightening agent according to any one of items 1-19, characterized in that it contains, in each case based on its weight, 0.05-5 wt.%, preferably 0.5-4 wt.%, particularly preferably 1-2 wt.%, of kaolin.Oxidative hair lightening agent according to one of points 1 - 20, characterized in that, based on its weight, at least one oil selected from mineral oils, branched fatty alcohols with 8 - 24 carbon atoms, dialkyl ethers with 6 to 18 C atoms in the alkyl groups, and mixtures of the aforementioned substances, is contained in a total amount of 0.2 - 80 wt.%, preferably 1 - 70 wt.%, particularly preferably 4 - 60 wt.%, extraordinarily preferably 5 - 20 wt.%. Oxidative hair lightening agent according to one of points 1 - 21, characterized in that, based on its weight, at least one oil selected from mineral oils and 2-octyl-1-dodecanol and mixtures of the aforementioned substances is contained in a total amount of 0.2 - 10 wt.%, preferably 1 - 7 wt.%, particularly preferably 4 - 6 wt.%, extraordinarily preferably 5 - 5.5 wt.%.Oxidative hair lightening agent according to one of points 1 - 22, characterized in that, based on its weight, at least one oil selected from mineral oils and di-n-octyl ether and mixtures of the aforementioned substances is present in a total amount of 0.2 - 10 wt.%, preferably 1 - 7 wt.%, particularly preferably 4 - 6 wt.%, extraordinarily preferably 5 - 5.5 wt.%. 24. A method for lightening or lightening coloring hair, characterized in that an oxidative hair lightening agent (B) according to one of points 1 - 23 is mixed with an oxidation composition (Ox) which, in each case based on its weight, 50 - 96 wt.%, preferably 70 - 93 wt.%, particularly preferably 80 - 90 wt.%, of water and 0.5 - 20 wt.%-% hydrogen peroxide and further contains at least one pH adjuster in such an amount that the oxidation composition has a pH in the range of 1.5 to 5.5, measured at 20°C, immediately thereafter applied to the keratin-containing fibers, left on the fibers for 5 to 60 minutes and then the fibers are rinsed with water and optionally washed out with a surfactant-containing cleaning agent, wherein the oxidative hair lightening agent (B) and the oxidation composition (Ox) are preferably mixed with one another in a weight-related ratio (B): (Ox) of 0.2 - 2, particularly preferably 0.3 - 1.5, further preferably 0.5 - 1. 25.A method for lightening or lightening hair coloring according to claim 24, characterized in that the mixture of the oxidative hair lightening agent (B) according to any one of points 1 - 23 and the oxidation composition (Ox), optionally after addition of a third alkalizing component, has a pH of 8.0 to 11.5, preferably in the range of 8.5 to 11.0, particularly preferably 9.0 - 10.5, extraordinarily preferably 9.5 - 10.3, in each case measured at 20°C. 26. Multi-component packaging unit (kit of parts) for lightening hair, which contains at least two separately packaged components and which is characterized in that i) the first component (B) is a hair lightening agent according to any one of points 1 - 23, ii) the second component (Ox) is an oxidation composition which, in each case based on its weight, 50 - 96 wt.%, preferably 70 - 93 wt.%, particularly preferably 80 - 90 wt.%, of water and 0.5 - 20 wt.-% hydrogen peroxide and has a pH in the range of 1.5 to 5.5, measured at 20°C, wherein the components (B) and (Ox) are preferably present in a weight-related ratio (B):(Ox) of 0.2-2, particularly preferably 0.3-1.5, further preferably 0.5-1, extremely preferably 0.5-0.6. The following examples illustrate the subject matter of the invention without limiting it thereto. Experimental Part 1. Investigations on heat development Table 1: Bleaching powder (all amounts in wt.%). Table 2: Developer containing oxidizing agent (all quantities in wt.%) Each of the bleaching powders from Table 1 was mixed with the hydrogen peroxide-containing oil-in-water emulsion from Table 2 in a 1:1 weight ratio in a mixing bowl. The temperature profile in the bleaching agent mixture in the mixing bowl was measured at regular intervals. The results are shown in Table 5. The temperature profile in the bleaching agent mixture was measured at regular intervals. The results are shown in Table 3. Table 3: Temperature profile [Temperature in °C] The ready-to-use bleaching agent mixture V2, which contains ammonium chloride, heats up significantly more slowly and to a significantly lower temperature than the ready-to-use bleaching agent mixture V1 without ammonium chloride. Replacing the complexing agent Na2-EDTA, not used according to the invention, with the complexing agent Na3-MGDA (Na3-MGDS), used according to the invention, leads to a further reduction in the mixing temperature. The experimental setup described above, with the temperature determination in the mixing bowl, systematically underestimates the temperature development on the hair. Hair is often exposed to heavy metal ions, particularly copper ions from tap water, which catalyze heat development. Therefore, even slight heat tints, i.e., reductions in heat development, in the mixing bowl are important to achieve a significant improvement in the heat tint on the hair. 2.Hair lightening procedure Table 4: Developer containing oxidizing agent for bleaching powder (all quantities in % by weight). Each of the bleaching powders from Table 1 was mixed with the hydrogen peroxide-containing oil-in-water emulsion according to Table 4 in a mixing bowl at a weight ratio of 1:1.5 (2 parts by weight of bleaching powder and 3 parts by weight of H2O2 developer) to form a ready-to-use bleaching agent. The ready-to-use bleaching agents each had a pH of 9.5, measured at 20°C. The respective ready-to-use bleaching agent was applied to dry hair strands of shade 6-0 (light brown, Fischbach & Miller) (liquor ratio of 4 grams of ready-to-use bleaching agent per gram of hair) and rinsed out after 45 minutes of contact time. The strands were then shampooed and dried. 3. Swelling Behavior Tests Table 4: Bleaching Powder (all quantities in wt.%) Table 5: Developer containing oxidizing agent Each of the bleaching powders from Table 4 was mixed with the hydrogen peroxide-containing oil-in-water emulsion according to Table 5 in a 1:1 weight ratio in a mixing bowl and poured into a measuring cylinder. The volume of the ready-to-use bleaching agent mixture was measured at regular intervals. The results are shown in Table 6: Table 6: Volume change over time of the ready-to-use bleaching agent mixture [ml] By adding ammonium chloride (E2, E3) or potassium chloride (E4), the unwanted foaming of the ready-to-use bleaching agent mixture during the application time on the hair was significantly reduced. A salt such as calcium chloride hexahydrate (V5) did not achieve a similar effect.

Claims

Patent claims 1. Oxidative hair lightening agent for lightening or lightening hair, containing a) at least one oxidizing agent selected from the inorganic salts of a peroxosulfuric acid, as well as mixtures of these salts, b) furthermore at least one complexing agent selected from complexing agents of general formula (I), wherein R1 represents a hydrogen atom, a C1-C6 alkyl group, a hydroxy C2-C6 alkyl group, a carboxy C1-C6 alkyl group, or a physiologically acceptable salt thereof; R2 and R3 independently represent a hydrogen atom, a C1-C6 alkyl group, a hydroxy C2-C6 alkyl group, a carboxy C1-C6 alkyl group, or a physiologically acceptable salt thereof, wherein R2 and R3 do not simultaneously represent a hydrogen atom and not simultaneously represent a carboxy C1-C6 alkyl group; and M1 and M2 independently represent a hydrogen atom or an alkali metal ion, preferably sodium, potassium, or an ammonium ion (NH4). +) stand, and c) at least one salt selected from ammonium chloride and potassium chloride and mixtures thereof, d) and 0 to 10 wt.%, preferably 0.1 to 8 wt.%, particularly preferably 0.5 to 5 wt.% water, in each case based on the weight of the oxidative hair lightening agent.

2. Oxidative hair lightening agent according to claim 1, characterized in that the at least one oxidizing agent a) is contained in a total amount of 5 to 85 wt.%, preferably 10 to 70 wt.%, particularly preferably 17 to 55 wt.%, most preferably 22 to 45 wt.%, in each case based on the weight of the oxidative hair lightening agent. 3.Oxidative hair lightening agent according to claim 1 or 2, characterized in that at least one oxidizing agent a) is selected from sodium peroxodisulfate, potassium peroxodisulfate, ammonium peroxodisulfate, sodium peroxomonosulfate, potassium peroxomonosulfate, ammonium peroxo-monosulfate and mixtures of these compounds, preferably potassium peroxodisulfate-ammonium peroxodisulfate mixtures, potassium peroxodisulfate-ammonium peroxodisulfate-sodium peroxodisulfate-. Mixtures and potassium peroxodisulfate-sodium peroxodisulfate mixtures, particularly preferably potassium peroxodisulfate-ammonium peroxodisulfate mixtures, and extraordinarily preferably potassium peroxodisulfate-ammonium peroxodisulfate mixtures with an excess of potassium peroxodisulfate, which are free of sodium peroxodisulfate.

4. Oxidative hair lightening agent according to any one of claims 1-3, characterized in that the at least one complexing agent b) of general formula (I) is selected from methylglycine diacetic acid, the sodium salts, potassium salts, and ammonium salts of methylglycine diacetic acid, as well as mixtures of the aforementioned substances, wherein the disodium salt and the trisodium salt of methylglycine diacetic acid are preferred, and the trisodium salt of methylglycine diacetic acid is particularly preferred. 5.An oxidative hair lightening agent according to any one of claims 1-4, characterized in that the at least one complexing agent b) is contained in a total amount of 0.1 to 5.0 wt.%, preferably 0.2 to 2.0 wt.%, particularly preferably 0.4 to 1.6 wt.%, and most preferably 0.5 to 1.0 wt.%, in each case based on the weight of the oxidative hair lightening agent.

6. An oxidative hair lightening agent according to any one of claims 1-5, characterized in that the trisodium salt of methylglycine diacetic acid is contained in an amount of 0.1 to 5.0 wt.%, preferably 0.2 to 2.0 wt.%, particularly preferably 0.4 to 1.6 wt.%, and most preferably 0.5 to 1.0 wt.%, in each case based on the weight of the oxidative hair lightening agent.

7. Oxidative hair lightening agent according to one of claims 1-6, characterized in that the ammonium chloride c) is present in an amount of 0.1 to 10.0 wt.%, preferably 1.0 to 8.0 wt.%, particularly preferably 2.0 to 6.0 wt.%.-%, most preferably 3.1–5.0 wt.%, in each case based on the weight of the oxidative hair lightening agent.

8. Oxidative hair lightening agent according to any one of claims 1–7, characterized in that the potassium chloride c) is contained in an amount of 0.1 to 10.0 wt.%, preferably 1.0 to 8.0 wt.%, most preferably 2.0 to 6.0 wt.%, most preferably 3.1–5.0 wt.%, in each case based on the weight of the oxidative hair lightening agent.

9. Oxidative hair lightening agent according to any one of claims 1–8, characterized in that it contains at least one alpha-amino acid and / or one beta-amino acid, which is preferably selected from serine, arginine, the salts of these amino acids, and mixtures of the aforementioned substances, with mixtures of serine and arginine being particularly preferred. 10.Oxidative hair lightening agent according to one of claims 1 - 9, characterized in that at least one alkali metal or alkaline earth metal salt of a C12-C24 monocarboxylic acid, which is saturated. or unsaturated, linear or branched, wherein the C12-C24 monocarboxylic acid is preferably selected from lauric acid, myristic acid, palmitic acid, palmitoleic acid, stearic acid, isostearic acid, oleic acid, elaidic acid, petroselinic acid, arachidic acid, gadoleic acid, behenic acid, erucic acid and brassidic acid, and mixtures thereof, wherein stearic acid and palmitic acid, and mixtures thereof, are particularly preferred, and wherein the potassium, magnesium and calcium salts of the C12-C24 monocarboxylic acid are extremely preferred.

11. Oxidative hair lightening agent according to any one of claims 1 to 10, characterized in that it contains 0.05–0.5 wt.%, preferably 0.2–0.4 wt.% sodium hexametaphosphate, in each case based on the weight of the oxidative hair lightening agent. 12.An oxidative hair lightening agent according to any one of claims 1-11, characterized in that it further comprises at least one dicarboxylic acid having 2 to 10 carbon atoms, selected from succinic acid, oxalic acid, malonic acid, adipic acid, pimelic acid, corticic acid, azelaic acid, sebacic acid, malic acid, D-tartaric acid, L-tartaric acid, meso-tartaric acid, racemic acid, alpha-ketoglutaric acid, beta-ketoglutaric acid, oxaloacetic acid, maleic acid and fumaric acid, the salts of the aforementioned acids and mixtures of the aforementioned substances, wherein preferably the at least one dicarboxylic acid having 2 to 10 carbon atoms and / or its salt(s) is present in a total amount of 0.2 to 4.0 wt.%, preferably 0.33 to 3.0 wt.%, particularly preferably 0.5 to 2.0 wt.%, and most preferably 0.7 to 1.0 wt.%. converted to the undissociated acid and based on the weight of the oxidative hair lightening agent. 13.Oxidative hair lightening agent according to one of claims 1-12, characterized in that it contains at least one inorganic alkalizing agent, solid at 20 °C and 1013 mbar, in a total amount of 4-70 wt.%, preferably 10-60 wt.%, particularly preferably 15-50 wt.%, further particularly preferably 20-55 wt.%, and most preferably 30-40 wt.%, based on the weight of the oxidative hair lightening agent.

14. Method for lightening or lightening keratinous fibers, in particular human hair, characterized in that an oxidative hair lightening agent (B) according to one of claims 1 – 13 is mixed with an oxidation composition (Ox) which, based on its weight, comprises 50 – 96 wt.%, preferably 70 – 93 wt.%, particularly preferably 80 – 90 wt.%, water and 0.5 – 20 wt.%.-% hydrogen peroxide and furthermore contains at least one pH adjuster in such an amount that the oxidation composition has a pH value in the range of 1.5 to 5.5, measured at 20°C, is applied immediately thereafter to the keratin-containing fibers, left on the fibers for 5 to 60 minutes and then the fibers are rinsed with water and optionally washed with a surfactant-containing detergent, wherein the oxidative hair lightening agent (B) and the oxidation composition (Ox) are preferred. in a weight-based ratio (B) : (Ox) of 0.2 – 2, particularly preferably 0.3 – 1.5, more preferably 0.5 – 1.

15. Multi-component packaging unit (kit-of-parts) for lightening keratinous fibers, comprising at least two separately packaged components and characterized in that i) the first component (B) is an oxidative hair treatment agent according to any one of claims 1 – 13, ii) the second component (Ox) is an oxidation composition comprising, based on their respective weights, 50 – 96 wt.%, preferably 70 – 93 wt.%, particularly preferably 80 – 90 wt.%, water and 0.5 – 20 wt.%.-% hydrogen peroxide and furthermore contains at least one pH adjusting agent in such an amount that the oxidation composition has a pH value in the range of 1.5 to 5.5, measured at 20°C, wherein the components (B) and (Ox) are preferably present in a weight ratio (B) : (Ox) of 0.2 – 2, particularly preferably 0.3 – 1.5, more preferably 0.5 – 1, and most preferably 0.5 – 0.6.

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