Bleaching compositions comprising phosphosilicates

Abstract

A bleaching and / or lightening composition A for keratin fibers, preferably human keratin fibers, more preferably human hair, comprising: a) one or more phosphosilicate(s), b) one or more metasilicate(s), and c) one or more persalt(s) and / or peroxy salt(s). A two-part bleaching and / or lightening composition for keratin fibers, preferably human hair, wherein the first composition is said composition A and the second composition B is an aqueous acidic composition comprising hydrogen peroxide having a pH in the range of 1 to 6. Process of bleaching keratin fibers using said two-part bleaching composition.

Description

[0001] BLEACHING COMPOSITIONS COMPRISING PHOSPHOSILICATES

[0002] Field of the invention

[0003] The present invention relates to usage of bioactive glass as alkalizing agent in bleaching and / or lightening products to improve lift of keratin fibers, a two-part bleaching and / or lightening composition, and a process of human hair bleaching.

[0004] Background of the invention

[0005] Many people want hair colors that are different from their natural hair color. Higher shades, especially blonde shades, are often desired. To achieve this, the hair color needs to be lifted. This gives consumers the opportunity to change their naturally or artificially colored hair to the desired lighter shades. Also, in order to achieve bright colors, such as fashion colors, a light base must be achieved as a first step before coloring. Therefore, bleaching is used to make hair lighter / blonder or as a preparation for coloring. In both cases, different applications can be used, such as full head lightening, as well as partial treatments, such as streaks for highlights or lifting the tips, e.g. for balayage. It is often desired to lighten as much as possible.

[0006] The aim of hair bleaching or hair lightening is to destroy the natural red or yellow-brown pigment in hair or to convert them to lighter or colorless compounds. By that especially the alkalizing agent is an important part of the bleach composition, since it determines the pH and the amount of alkali.

[0007] FR2915679 discloses a hair care product containing bioactive glass. The document is silent on bleaching.

[0008] W0200910367A2, W0200910415A2 and W02009010367 disclose hair coloring and permanent waving compositions, but no bleaching compositions.

[0009] There still is a strong consumer need to develop hair bleaching products with lower damage and higher lift. Summary of the invention

[0010] Therefore, the first object of the present invention is a bleaching and / or lightening composition A for keratin fibers, preferably human keratin fibers, more preferably human hair, comprising: a) one or more phosphosilicate(s), b) one or more metasilicate(s), and c) one or more persalt(s) and / or peroxy salt(s).

[0011] The second object of the present invention is a two-part bleaching and / or lightening composition for keratin fibers, preferably human keratin fibers, more preferably human hair, wherein the first composition A is a composition as defined above and the second composition B is an aqueous acidic composition comprising hydrogen peroxide having a pH in the range of 1 to 6.

[0012] The third object of the present invention is a ready to use bleaching and / or lightening composition for keratin fibers, preferably human keratin fibers, more preferably human hair, having a pH in the range of 7 to 12 comprising:

[0013] - the composition A as defined above, and

[0014] - the composition B as defined above.

[0015] The fourth object of the present invention is a process for bleaching of keratin fibers, preferably human keratin fibers, more preferably human hair, comprising the steps of: i) optionally washing the keratin fibers with a cleansing composition and drying the fibers; then ii) mixing the bleaching and / or lightening composition A as defined above with the aqueous acidic composition B as defined above to prepare the ready to use composition as defined above; then iii) applying the ready to use composition onto keratin fibers and leaving it for a period of 1 min to 45 min, preferably 10 min to 30 min, more preferably 15 min to 25 min; then iv) rinsing off the keratin fibers with water or optionally washing with a cleansing composition; then v) optionally drying the keratin fibers.

[0016] Detailed description of the invention

[0017] The inventors of the present invention have surprisingly and unexpectedly found that the invention according to the independent claims provides for improved lift of the bleaching product without increasing the damage to the hair fibers. Furthermore, the cosmetic appearance of the hair fibers was improved, i.e., the touch, feel and shine of the fibers upon bleaching with the inventive composition and process were superior.

[0018] Bleaching and / or lightening composition A

[0019] The present invention is directed to a bleaching and / or lightening composition A for keratin fibers, preferably human keratin fibers, more preferably human hair, comprising: a) one or more phosphosilicate(s), b) one or more metasilicate(s), and c) one or more persalt(s) and / or peroxy salt(s).

[0020] Suitable one or more phosphosilicates according to group a) are calcium sodium phosphosilicates. They are commercially available under the names Vitryxx (Schott) or Actysse (Engelhard Corporation).

[0021] The chemical composition of the bioactive glass Vitryxx as described by Schott Glass is composed of four inorganic oxides, about 45% by weight silicon dioxide (SiC>2), about 24.5% by weight sodium oxide (Na20), about 6% phosphorus oxide (P2O5), and about 24.5% by weight calcium oxide (CaO).

[0022] Actysse BG is a particulate bioactive glass mixed with mica available from Engelhard Corporation. Actysse BG mixture consists of 94-97% by weight of calcium sodium phosphosilicate and of 3-6% by weight of mica.

[0023] It is preferred from the viewpoint of alkalinity and keratin fiber damage that the total concentration of phosphosilicates according to group a), preferably the total concentration of calcium sodium phosphosilicates, is in the range of 0.1 % to 20% by weight, preferably 0.5% to 15% by weight, more preferably 1 % to 9% by weight, calculated to the total weight of the composition A.

[0024] The composition A of the present invention comprises one or more metasilicates according to group b). Preferably, the one or more metasilicates is sodium metasilicates, and more preferably the total concentration of metasilicates according to group b), still more preferably the total concentration of sodium metasilicate, is in the range of 0.5% to 20% by weight, still more preferably in the range of 1 % to 15% by weight, still more preferably in the range of 2% to 10% by weight, calculated to the total weight of composition A.

[0025] If is further preferred from the viewpoint of bleaching performance and damage reduction that the weight ratio of compound(s) according to group a) and compound(s) according to group b) in composition A is in the range of 0.1 to 10, more preferably in the range of 0.25 to 8, still more preferably in the range of 0.25 to 6.

[0026] The composition of the present invention comprises one or more persalt(s) and / or peroxy salt(s) as compounds according to group c). Suitable one or more persalt(s) and / or peroxy salt(s) are selected from persalts or peroxides, such as sodium persulfate, potassium persulfate, ammonium persulfate, earth alkali peroxides, such as magnesium peroxide, melamine peroxide or urea peroxide or phthalimidoperoxy hexanoic acid, and / or their mixtures. The preferred persalts from the viewpoint of bleaching power are sodium, potassium, and ammonium persulfate, and / or their mixtures.

[0027] It is preferred from the viewpoint of bleaching power and cosmetic safety that the total concentration of persalts and / or peroxy salts in composition A is in the range of 10% to 80% by weight, preferably 15% to 70% by weight, more preferably 20% to 60% by weight, and still more preferably 25% to 60% by weight, calculated to the total weight of the composition A.

[0028] It is preferred from the viewpoint of bleaching power that the composition A of the present invention comprises one or more alkalizing agent(s) different from the groups a) and b), preferably selected from phosphates, disilicates, ammonia, carbonates, and / or Tris(hydroxymethyl)aminomethane (TRIS), and / or its / their salts, and / or mixtures. More preferably the one or more alkalizing agent(s) different from phosphosilicates are sodium disilicate, or Tris(hydroxymethyl)aminomethane (TRIS) and / or its salts.

[0029] It is preferred from the viewpoint of bleaching power that the composition A of the present invention comprises one or more alkalizing agent(s) different from the ones of group a) and b) at a total concentration in the range of 0.1 % to 25% by weight, further preferably in the range of 0.5% to 20% by weight, more preferably in the range of 1 % to 15% by weight, calculated to the total weight of composition A.

[0030] Preferably, the composition A according to the present invention comprises water at 10% by weight or less, more preferably at 1 % by weight or less, calculated to the total weight of composition A, more preferably composition A is anhydrous. The term anhydrous is to be understood that no water is added to the composition. However, this does not exclude any crystal water, adhering air moisture, or water bound to the ingredients by, for example, capillary forces.

[0031] Thickening polymers

[0032] In case the viscosity needs to be further adjusted, composition A may comprise one or more thickeners, preferably thickening polymers, from the viewpoint of cosmetic safety.

[0033] The composition A of the present invention may comprise one or more thickening polymer(s) selected from non-ionic thickening polymers and / or anionic thickening polymers, and / or their mixtures.

[0034] Preferably, the thickening polymer are selected from polymers resulting in an aqueous solution and / or aqueous dispersion at pH between 1 and 6 having a viscosity of at least 1 ,000 mPa*s measured at a polymer concentration of 1 % by weight in water at 25 °C, calculated to the total weight of the composition, determined by a Brookfield viscometer, such as at 10 rpm for 1 min, with an appropriate spindle at 25%.

[0035] Suitable non-ionic thickening polymers are cellulose-based polymers. Suitable examples of cellulose-based polymers are methylcellulose, hydroxymethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, hydroxyethyl-methylcellulose, and alkylated hydroxyl celluloses such as (C2-C8)-alkylcelluloses or cetyl hydroxyethylcellulose.

[0036] Suitable anionic thickening polymers are selected from naturally-based anionic polymers and / or synthetic anionic polymers.

[0037] Suitably, the natural anionic polymer(s) may be selected from hypromellose, xanthan gum, dehydroxanthan gum, hydroxypropylxanthan gum, carboxymethyl cellulose and starch-based polymers such as vegetable starch and / or their synthetically modified derivatives such as hydroxyproply starch phosphate. Equally suitable are alginic acids, sodium alginates, ammonium alginates, calcium alginates, gum arabic, and quar gum.

[0038] The preferred thickening polymer for the composition of the present invention are natural anionic polymers, more preferably hypromellose, xanthan gum and / or, dehydroyanthan gum, from the viewpoint of their biodegradability and low environmental impact.

[0039] Preferably, the composition A according to the present invention comprises thickeners at a total concentration in the range of 1 % to 10% by weight, preferably in the range of 3% to 7% by weight, calculated to the total weight of composition A.

[0040] Product forms of the bleaching composition

[0041] The composition A according to the present invention may be a bleaching powder composition and preferably comprises one or more pulverulent excipients as filling material.

[0042] Any pulverulent excipient not reacting with the alkalizing agents is suitable for the purpose of the present invention. Suitable excipients are selected from organic / inorganic materials such as silicates, diatomaceous earth, kaolin, bentonite, cellulose, starch especially corn, tapioca, rice, wheat and potato, nylon powder, montmorillonite, gypsum, sawdust and perlite. The preferred pulverulent excipients for the powder composition is diatomaceous earth.

[0043] The powder composition A according to the invention may comprise pulverulent excipients at a total concentration in the range of 20% to 80% by weight, preferably 25% to 75% by weight, calculated to the total weight of composition A. It is further preferred from the viewpoint of cosmetic safety that the bleach powder composition is dust-free. This property can commonly be achieved by adding lipophilic compounds to the bleaching powder, preferably at concentration ranges from 1 % to 10% by weight, calculated to the total weight of the bleach powder composition. These lipophilic compounds may be the same as defined below.

[0044] Bleaching and / or lightening paste composition

[0045] The composition A according to the invention may be an oil composition comprising one or more lipophilic compound(s) liquid at 20 °C and atmospheric pressure. Suitable lipophilic compound(s) are selected from fatty alcohols, fatty acids, waxes, vegetable oils, petrolatum-based products, silicones, aminated silicones, and compounds according to the general structure: wherein R1is selected from linear or branched, saturated or unsaturated alkyl with Cn to C21 and optionally modified with 1 hydroxyl group, and R2is selected from linear or branched, saturated or unsaturated alkyl with C3 to Cis. Suitable compounds according to the general structure from above are isopropyl palmitate, isopropyl myristate, octyl palmitate, isocetyl palmitate, octyl stearate, oleyl oleate, ethylhexyl hydroxystearate, myristyl myristate, behenyl behenate, and / or their mixtures.

[0046] Suitable fatty alcohols are linear or branched, saturated or unsaturated fatty alcohols with C12 to C22 are lauryl alcohol, tridecyl alcohol, myristyl alcohol, pentadecyl alcohol, cetyl alcohol, palmitoleyl alcohol, heptadecyl alcohol, stearyl alcohol, nonadecyl alcohol, arachidyl alcohol, behenyl alcohol, and / or their mixtures.

[0047] Suitable fatty acids are saturated or unsaturated fatty acids with or without a hydroxyl group. Suitable are myristoleic acid, palmitoleic acid, oleic acidlinoleic acid, arachidonic acid, and / or their mixtures.

[0048] Suitable vegetable oils are jojoba oil, avocado oil, sunflower seed oil, walnut oil, peanut oil, olive oil, rapeseed oil, cottonseed oil, palm oil, sesame oil, soybean oil, coconut oil, safflower oil, almond oil, macadamia nut oil, grapefruit seed oil, lemon kernel oil, orange kernel oil, apricot kernel oil, castor oil, and / or their mixtures.

[0049] Suitable petrolatum-based products are liquid paraffins, especially paraffinum perliquidum and paraffinum subliquidum, and mineral oil, in particular white mineral oil, and / or their mixtures.

[0050] Suitable silicones are dimethylpolysiloxanes, and modified silicones (for example, amino-modified silicones, fluorine-modified silicones, alcohol-modified silicones, polyether-modified silicones, epoxy-mod if ied silicones, or alkyl-modified silicones), but dimethylpolysiloxane, polyether-modified silicones and amino-modified silicones are preferred. Amino-modified silicones are commonly known under their CTFA name amodimethicone.

[0051] Specific examples of suitable commercially available amodimethicone oils such as SF8452C, SS-3551 (all by Dow Coming Toray Co., Ltd.), KF-8004, KF-867S, and KF- 8015 (all by Shin-Etsu Chemical Co., Ltd.), and amodimethicone emulsions such as SM8704C, SM8904, BY22-079, FZ-4671 , and FZ-4672 (all by Dow corning Toray Co., Ltd.).

[0052] The amino-modified silicone may be any silicone having an amino group or a quaternary ammonium group, and examples thereof include amine-modified silicone oil having all or a part of the terminal hydroxyl groups capped with a methyl group for example, and an amodimethicone which does not have the terminals capped.

[0053] The composition may comprise one or more waxes. Suitable non-limiting and preferred examples are petrolatum, ozokerit, carnauba wax, paraffin, lanolin wax, candelila wax, bees wax, microcrystalline wax and cocoglycerides.

[0054] Preferably, the composition A comprising one or more lipophilic compound(s) liquid at 20 °C and atmospheric pressure is a bleach paste composition. For attaining this aspect of the invention, composition A may comprise one or more lipophilic compound(s) liquid at 20 °C and atmospheric pressure at a total concentration in the range of 20% to 80% by weight, preferably 25% to 75% by weight, calculated to the total weight of composition A. The composition A according to the invention comprises one or more chelating agents. Suitable chelating agents are selected from ethylenediaminetetraacetic acid (EDTA), nitrilotriacetic acid, polyoxycarboxylic acids, polyphosphonates polyamines, citric acid, phosphoric acid, citraconic acid, ascorbic acid, and / or its / their salt(s). The preferred chelating agents is / are ethylenediaminetetraacetic acid (EDTA) and / or its salt(s).The composition A according to the invention may comprise chelating agents at a total concentration in the range of 1 % to 10% by weight, preferably 1.5% to 5% by weight, calculated to the total weight of composition A.

[0055] Two-part bleaching and / or lightening composition

[0056] Another aspect of the present invention is a two-part bleaching and / or lightening composition for keratin fibers, preferably human keratin fibers, more preferably human hair, wherein the first composition A is a composition as defined above and the second composition B is an aqueous acidic composition comprising hydrogen peroxide having a pH in the range of 1 to 6.

[0057] The second composition B is an aqueous acidic composition comprising hydrogen peroxide (H2O2) and having a pH in the range of 1 to 6. Suitable concentration ranges for hydrogen peroxide are from 0.1 % to 20% by weight, preferably 0.25% to 15% by weight, and more preferably 0.5% to 12% by weight, calculated to the total weight of the second aqueous composition B.

[0058] The pH of the second aqueous composition B preferably is in the range of 1.5 to 5, more preferably in the range of 2 to 4.5, adjusted by suitable acids and bases.

[0059] Optionally, the second acidic composition B according to the present invention comprises one or more lipophilic compounds being liquid, as already defined above.

[0060] The mixture of the first and the second composition preferably has a pH in the range of 7 to 12, more preferably in the range of 9 to 11 to ensure the bleaching / lightening of keratin fibers, preferably human hair. Ready to use bleaching and / or lightening composition

[0061] Still another aspect of the present invention is a ready to use bleaching and / or lightening composition for keratin fibers, preferably human hair, having a pH in the range of 7 to 12 comprising:

[0062] - the composition A as defined above, and

[0063] - the composition B as defined above.

[0064] Preferably, the ready to use composition is an aqueous composition comprising water at 50% by weight or more, calculated to the total weight of the ready to use composition.

[0065] It is preferred from the viewpoint of cosmetic safety and bleaching performance that the pH of the ready to use composition is in the range of 9 to 11 .

[0066] Process for human hair bleaching

[0067] Still another aspect of the present invention is a process for bleaching of keratin fibers, preferably human keratin fibers, more preferably human hair, comprising the steps of: i) optionally washing the hair with a cleansing composition and drying the hair; then ii) mixing the bleaching and / or lightening composition A as defined in any of the claims 1 to 12 with the aqueous acidic composition B as defined in claim 13 to prepare the ready to use composition as defined in the claim 14; then iii) applying the ready to use composition onto keratin fibers and leaving it for a period of 1 min to 45 min, preferably 10 min to 30 min, more preferably 15 min to 25 min; then iv) rinsing off the hair with water or optionally washing with a cleansing composition; then v) optionally drying the hair.

[0068] The following examples are to illustrate the invention, but not to limit it. EXAMPLES

[0069] Powder formulations as shown below were prepared by conventional mixing techniques.

[0070] Alternatively, isopropyl myristate may be added to the composition instead of diatomaceous earth to prepare an oil composition.

[0071] Discussion of results

[0072] The results clearly show that the combination of Sodium Metasilicate with Calcium Sodium Phosphosilicate achieves the highest lift compared to powder formulations with Sodium Metasilicate only or Calcium Sodium Phosphosilicate only. Furthermore, the stress-strain results showed that the damage, represented by the 2% index, caused by the combination of Calcium Sodium Phosphosilicate and metasilicate is reduced compared to metasilicate alone (cf. ex. 1 ).

[0073] Methods

[0074] For the experiments the bleaching powder (compositions A) was mixed with an oxidative composition B containing 6 wt. % of hydrogen peroxide in a weight ratio of 1 :1.4. Subsequently this mixture was applied on dark human hair (Fischbach + Miller Haar, Laupheim, Germany). After 40 min storage at 40 °C the hair was rinsed and shampooed. After that the hair was blow dried and the L values were measured. The colormetric measurements were performed with a Datacolor 45G instrument

[0075] After measuring the Lightening value, the hair was exposed to the stress-strain test to measure the damage caused by the bleaching powder.

[0076] Damage was assessed, for twenty-five individual hair fibers per treatment, via tensile test using an MTT680 instrument (Dia-Stron Limited, Andover, UK), in the wet condition. The initial sample length used was thirty millimetres and the strain rate was 100 percent per minute. The damage value is expressed as the stress (in MPa) at two percent or twenty five percent strain, where the higher number indicates lower damage.

Claims

Claims1 . A bleaching and / or lightening composition A for keratin fibers, preferably human keratin fibers, more preferably human hair, comprising: a) one or more phosphosilicate(s), b) one or more metasilicate(s), and c) one or more persalt(s) and / or peroxy salt(s).

2. The composition according to claim 1 characterized in that the one or more phosphosilicates according to group a) is / are one or more calcium sodium phosphosilicate(s).

3. The composition according to any of the claims 1 and / or 2 characterized in that total concentration of phosphosilicates according to group a), preferably the total concentration of calcium sodium phosphosilicates, is in the range of 0.1 % to 20% by weight, preferably 0.5% to 15% by weight, more preferably 1 % to 9% by weight, calculated to the total weight of composition A.

4. The composition according to any of the preceding claims characterized in that the one or more metasilicates according to group b) is sodium metasilicate, and preferably the total concentration of metasilicates according to group b), more preferably the total concentration of sodium metasilicate, is in the range of 0.5% to 20% by weight, preferably in the range of 1 % to 15% by weight, more preferably in the range of 2% to 10% by weight, calculated to the total weight of composition A.

5. The composition according to any of the preceding claims characterized in that the weight ratio of compounds according to group a) and compounds according to group b) is in the range of 0.1 to 10, preferably in the range of 0.25 to 8, more preferably in the range of 0.25 to 6.

6. The composition according to any of the previous claims characterized in that the one or more compounds according to group c) is / are selected from sodium persulfate, potassium persulfate, ammonium persulfate, earth alkali peroxides, such as magnesium peroxide, melamine peroxide or urea peroxide or phthalimidoperoxy hexanoic acid, and / or their mixtures, preferably the one or more compounds accordingto group c) is / are selected from sodium, potassium, and ammonium persulfate, and / or their mixtures.

7. The composition according to any of the preceding claims characterized in that the total concentration of one or more compounds according to group c) is in the range of 10% to 80% by weight, preferably 15% to 70% by weight, more preferably 20% to 60% by weight, and still more preferably 25% to 60% by weight, calculated to the total weight of composition A.

8. The composition according to any of the preceding claims characterized in that the composition A comprises one or more thickener(s), preferably the one or more thickening polymers selected from non-ionic thickening polymers such as the cellulose- based polymers methylcellulose, hydroxymethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, hydroxyethyl-methylcellulose, and alkylated hydroxyl celluloses such as (C2-C8)-alkylcelluloses or cetyl hydroxyethylcellulose, anionic thickening polymers such as the naturally-based anionic polymers and / or synthetic anionic polymers hypromellose, xanthan gum, dehydroxanthan gum, hydroxypropylxanthan gum, carboxymethyl cellulose, and starch-based polymers such as vegetable starch and / or their synthetically modified derivatives such as hydroxypropyl starch phosphate, or the alginic acids, sodium alginates, ammonium alginates, calcium alginates, gum arabic, and quar gum, more preferably the one or more thickening polymers are hypromellose, xanthan gum and / or dehydroxanthan gum.

9. The composition according to any of the preceding claims characterized in that the total concentration of thickeners in composition A is in the range of 1 % to 10% by weight, preferably 3% to 7% by weight, calculated to the total weight of composition A.

10. The composition according to any of the preceding claims characterized in that the composition A is a bleaching powder composition and preferably comprises one or more excipients selected from organic / inorganic materials such as silicates, diatomaceous earth, isopropyl myristate, kaolin, bentonite, cellulose, starch especially corn, tapioca, rice, wheat and potato, nylon powder, montmorillonite, gypsum, sawdust and perlite, and more preferably the total concentration of excipients in composition Ais in the range of 20% to 80% by weight, preferably 25% to 75% by weight, calculated to the total weight of composition A.

11. The composition according to any of the claims 1 to 9 characterized in that composition A is an oil composition comprising one or more lipophilic compound(s) liquid at 20 °C and atmospheric pressure, preferably the one or more lipophilic compound(s) liquid at 20 °C and atmospheric pressure are selected from fatty alcohols, fatty acids, waxes, vegetable oils, petrolatum based products, silicones, aminated silicones, and compounds according to the general structure:wherein R1is selected from linear or branched, saturated or unsaturated alkyl with Cn to C21 and optionally modified with 1 hydroxyl group, and R2is selected from linear or branched, saturated or unsaturated alkyl with C3 to Cis, more preferably the one or more lipophilic compound(s) liquid at 20 °C and atmospheric pressure according to the general structure are isopropyl palmitate, isopropyl myristate, octyl palmitate, isocetyl palmitate, octyl stearate, oleyl oleate, ethylhexyl hydroxystearate, myristyl myristate, behenyl behenate, and / or their mixtures.

12. The composition according to any of the preceding claims characterized in that the composition A comprises water at 10% by weight or less, preferably at 1 % by weight or less, calculated to the total weight of composition A, more preferably composition A is anhydrous.

13. A two-part bleaching and / or lightening composition for keratin fibers, preferably human hair, wherein the first composition A is a composition according to any of the claims 1 to 12 and the second composition B is an aqueous acidic composition comprising hydrogen peroxide having a pH in the range of 1 to 6.

14. A ready to use bleaching and / or lightening composition for keratin fibers, preferably human keratin fibers, more preferably human hair, having a pH in the range of 7 to 12 comprising: the composition A as defined in any of the claims 1 to 12, andthe composition B as defined in claim 13.

15. Process for bleaching of keratin fibers, preferably human keratin fibers, more preferably human hair, comprising the steps of: i) optionally washing the keratin fibers with a cleansing composition and drying the hair; then ii) mixing the bleaching and / or lightening composition A as defined in any of the claims 1 to 12 with the aqueous acidic composition B as defined in claim 13 to prepare the ready to use composition as defined in the claim 14; then iii) applying the ready to use composition onto keratin fibers and leaving it for a period of 1 min to 45 min, preferably 10 min to 30 min, more preferably 15 min to 25 min; then iv) rinsing off the keratin fibers with water or optionally washing with a cleansing composition; then v) optionally drying the keratin fibers.

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