Use of huntite mineral as a color enhancer in cosmetic applications and cosmetic compositions containing same

Abstract

The present invention relates to the use of the natural substance huntite powder, a calcium and magnesium carbonate mineral with the formula Mg3Ca(CO3)4, as a pigment color enhancer and, more generally, as a multifunctional ingredient for cosmetics. Due to its morphological and optical properties, huntite can perform various functions in cosmetics and replace, in whole or in part, some raw materials that are considered harmful to the environment or have been proven unsafe for human health. In the cosmetic compositions to which it is added, it also improves some functional and technical properties.

Description

[Technical field]

[0001] The present invention relates to the use of huntite mineral as a color enhancer in cosmetic applications and to cosmetic compositions containing it. More specifically, the present invention relates to the use of huntite powder, a natural mineral of calcium and magnesium carbonate with the formula Mg3Ca(CO3)4, as a color enhancer for pigments, and more broadly, as a multifunctional cosmetic ingredient that, due to its morphological and optical properties, can perform various functions in cosmetics and replace, in whole or in part, some raw materials that are considered harmful to the environment or have been proven unsafe for human health. Huntite also enhances several functional and technical properties in the cosmetic compositions to which it is added. [Background technology]

[0002] Among the raw materials used in the cosmetics industry, those in powder form represent a very important and diverse family of raw materials, being used in many cosmetic products, both in the form of milks, gels and solid products. Among the latter, there are anhydrous forms, essentially made of oils and waxes, which, once melted, are either in stick form (like lipstick) or poured into jars, and powder forms, which can be as they are or which are compressed using a press or baked in specific ovens to obtain the usual wafers.

[0003] Powdered ingredients are used in many cosmetic products, particularly for makeup, and can have a variety of functions, such as texturizers, fillers, absorbents, mattifying agents, "soft focus" enhancers, etc.

[0004] Fillers are used in powder formulations primarily to dilute the active ingredients and reduce the cost of the formulation. The most commonly used filler powder is talc, which is inexpensive, very smooth, and soft to the touch, but the cosmetic market is gradually moving away from this ingredient due to the risk of asbestos contamination and therefore possible health effects that it may pose (Gordon RE et al., Asbestos in commercial cosmetic talcum powder as a cause of mesothelioma in women, IJOEH 2014, 20(4): 318-332; Tran, TH et al., Talc, Asbestos, and Epidemiology: Corporate Influence and Scientific Incognizance, Epidemiology 2019, 30 (6): 783 788).

[0005] Other powders have also been considered as substitutes for talc. One example is mica, which is expensive, has a greyish colour and does not have the soft feel of talc. Another alternative is kaolin, which absorbs too much sebum and runs the risk of over-drying the skin. Alternatively, other substitutes include vegetable starches or clays, which often cause problems related to microbial contamination.

[0006] Colored powders, commonly called pigments, have the property of developing a color when applied to a surface, thus hiding the color of the surface. They therefore have the property of being able to "write". "Writing ability" is an intrinsic property of some powders and is directly proportional to their refractive index; that is, the higher the refractive index, the more difficult it is to see transparently through the powder and vice versa. The pigments most used in cosmetics are ionic compounds or metal oxides, the most common of which are iron oxides (yellow, red, black), zinc oxide (white) and titanium dioxide (white).

[0007] Titanium dioxide is undoubtedly the most widely used pigment, because, firstly, white is always the base color for preparing all other colors, and, secondly, it has better covering and lighting effects than any other white color on the market. However, a problem that cannot be ignored in the use of titanium dioxide is the fact that this compound is classified as a carcinogen by inhalation, which suggests a potential risk to the safety of cosmetics containing it, especially with regard to cosmetic powders. -up, easily inhalable (Baan, RA, Carcinogenic Hazards from Inhaled Carbon Black, Titanium Dioxide, and Talc not Containing Asbestos or Asbestiform Fibers: Recent Evaluations by an IARC Monographs Working Group, Inhal. Toxicol. 2007, 19: 213-228).

[0008] Another type of powder commonly used in cosmetic technology are texturizers (also called "skin-feel enhancers" in English), i.e. ingredients intended to improve the feel of cosmetic products, making them more velvety, creamy and smooth when picked up and / or applied. In general, these properties depend heavily on the size and shape of the particles that compose them, the coefficient of friction between them and their elasticity. Most of these powders are generally composed of synthetic, non-biodegradable polymers called "microplastics" (nylon, PMMA, PTFE, polyurethane, etc.), whose main problem is that they are not sustainable and that they irreversibly pollute the environment (Gouin T., et al., A Thermodynamic Approach for Assessing the Environmental Exposure of Chemicals Absorbed to Microplastic, Environ. Sci. Technol. 2011, 45(4): 1466-1472). Other solid powder materials used as texturizers, although more expensive, are silica powder, which features perfectly spherical particles, and mica itself, which is composed of lamellar particles.

[0009] Some powders are specifically chosen for their "soft focus" effect, i.e., their ability to penetrate into the skin's recesses and reflect light in multiple directions to hide wrinkles and imperfections, and to mattify and even the complexion. Sometimes this property can be combined with their oil-absorbing abilities to obtain a formula that is less oily yet also absorbs excess sebum and eliminates shine on the complexion.

[0010] From the above, it is clear that it would be very useful to have raw materials in powder form that can be used in the cosmetics industry to improve the performance of the above mentioned ingredients or as a total or partial replacement for ingredients that have proven to be potentially harmful to the environment and / or dangerous to human health, such as in particular microplastics, talc and titanium dioxide.In particular, it would be very advantageous to be able to include in the composition of a cosmetic makeup product a multifunctional ingredient that improves the coloring of the pigment and makes it possible to at least partially replace titanium dioxide as a white pigment. Summary of the Invention

[0011] In the framework of the research that led to the present invention, we considered the calcium and magnesium carbonate mineral huntite, which has been studied and used as a fire retardant in recent decades due to the excellent properties of its natural mixture with hydromagnesite (Kangal O., et al., A new industrial mineral: Huntite and its recovery, Minerals Engineering 2006, 19, 376-378;Hollingbery, LA, The Fire Retardant Behavior of Huntite and Hydromagnesite - A Review, Polym. Degr. Stab. 2010, 95, 2213-2225).

[0012] Huntite is a mineral composed of calcium and magnesium carbonates with the chemical formula Mg3Ca(CO3)4, which crystallizes in the trigonal system and is typically found deposited in dust-like masses characterized by water-wet planar crystals. When extracted, dried and crushed, its form is a very fine, airy, white lamellar powder that does not condense or aggregate. As an example, Figure 1 of the accompanying drawings is a micrograph of a huntite crystal (right) sandwiched between hydromagnesite crystals (left), Figure 2 shows the three-dimensional structure of the huntite crystal lattice, and Figure 3 is a photograph of huntite powder obtained from a Greek ore.

[0013] It is also known that due to its lamellar structure and white color, huntite can be used in paints as a filler powder (extender), allowing the amount of pigment (e.g., TiO2) to be reduced due to its fracturing and light diffusing properties (Sibelco, https: / / coatings.sibelcotools.com / mineral / huntite / ).

[0014] Additionally, a mixed magnesium and calcium carbonate material of formula Mg3Ca(CO3)4, which corresponds to huntite, can also be synthesized in the laboratory using carbonate as a reagent or through some cyanobacterial strains.

[0015] According to the present invention, it has been found that huntite has physicochemical and morphological properties suitable for performing various specific functions in cosmetic compositions, depending on the formulation in which it is added. These properties allow this material to totally or partially replace powdery raw materials such as talc, microplastics or titanium dioxide, which are not recommended for use in cosmetics for reasons such as environmental sustainability, health risks or commercial opportunities.

[0016] In particular, it has been found that huntite powder, added in suitable amounts to cosmetic formulations such as lipstick, eye shadow, foundation, concealer and nail varnish, has the ability to enhance the color and increase the intensity and brilliance of the pigments contained in these formulations, which also makes it possible to reduce the content of coloring ingredients such as pigments and lacquers while obtaining the same or better end result.

[0017] The present invention therefore takes advantage of the main characteristics of huntite powder, related to its lamellar shape and the complete absence of agglomerates, which give it a very soft and light feel, ease of processing and liquid dispersibility, to produce a powder with a high molecular weight of 1.0001 g / g, which is a 1.0001% soluble in water. For pigmentsWe propose to use huntite powder as a color enhancer, more broadly as a multifunctional cosmetic ingredient. Huntite typically has a very high white point (above 95%) according to ISO 2470, a refractive index in the range of 1.615-1.625 and a moderate oil absorption in the range of 50-60g / 100g according to ISO 787 / 5.

[0018] It should be noted that in addition to exhibiting properties already known and utilized in the paint field, such as white color and disintegrability relative to other powders due to its lamellar structure, powdered huntite is unexpectedly advantageous as a powder material for the manufacture of cosmetics, since, unlike mica, for example, it has a soft feel and also has adhesion to the skin. When used in cosmetics, it provides various additional effects, such as improving the texture and soft focus effect of the product, in addition to enhancing the writing ability of other pigments.

[0019] The particular features of the present invention and its advantages will become more apparent with reference to the accompanying drawings. [Brief description of the drawings]

[0020] [Figure 1] As already mentioned, a micrograph of huntite crystals (right side) together with hydromagnesite crystals (left side) is shown. [Diagram 2] As already mentioned, the three-dimensional structure of the huntite crystal lattice is shown together with the cell parameters. [Diagram 3] As already mentioned, a photograph of a huntite powder that can be used for the purposes of the present invention is shown. [Figure 4] FIG. 1 shows a comparison of the "write-on" of lipstick A.1 containing an ingredient of the present invention (powdered huntite) with lipstick A.0 of similar composition which does not contain it. [Diagram 5] FIG. 1 shows a comparison of the "write-in" of lipstick B.1 containing powdered huntite with lipstick B.0 of similar composition containing the same amount of mica instead. [Figure 6] The same lipstick "writing" of B.0 and B.1 as in the previous figure is shown deformed by running a finger across it. [Figure 7] FIG. 1 shows a comparison of the "write-in" of concealer C.1 containing powdered huntite with a concealer C.0 of similar composition containing the same amount of mica instead. [Figure 8] FIG. 1 shows a comparison of the "writing" of compact powder D.1 containing powdered huntite with compact powder D.0 of similar composition containing the same amount of titanium dioxide instead. [Figure 9] FIG. 1 shows the results of an instrumental comparison test for evaluating the color yield of solid lipstick formulations of Examples 6 and 7, where E.1 and F.1 represent formulations according to the invention. [Figure 10] FIG. 1 shows the results of an instrumental comparison test for evaluating the color yield of solid lipstick formulations of Examples 1 and 8, where A.1 and G.1 represent formulations according to the invention. [Figure 11] FIG. 1 shows the results of an instrumental comparison test to evaluate the color yield of eye shadow formulations of Examples 9, 10 and 11, where H.1.I.1 and L.1 represent formulations according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] The present invention relates to In a cosmetic product for makeup as defined in claim 1 of the present application , may have multiple additional functions For pigments As a color enhancer Natural The use of huntite powder is particularly provided.

[0022] Huntite has proven to be particularly advantageous as a color enhancer in cosmetic formulations, since its fine and lamellar particles are able to act as a disintegrant by breaking down pigment agglomerates during processing. Considering its writing ability, the color yield is thus significantly improved, and the colors are more opaque, uniform and vivid. This property allows the formulation of cosmetics (lipsticks, foundations, eye shadows, nail polish, etc.) with a low proportion of pigments, making them easier to process during preparation.

[0023] Moreover, huntite has a very high white point even though it has a low refractive index compared to TiO2. The fact that it is very fine and lamellar allows it to be distributed evenly on the skin. As a result, the opacity obtained is comparable to that of titanium dioxide. When the powder is wetted in water or oil, this property is lost and the opacity decreases because the particles disperse in the liquid and no longer adhere to the surface. This feature allows formulators to design cosmetic powder products such as free, compact and baked powders without the use of other white pigments.

[0024] It should be noted that other properties of the powdered huntite exemplified in the summary of the present invention are also highly sought after properties in cosmetic powders to ensure various further improvements. Specifically, huntite may have the following additional uses and applications in the cosmetic field:

[0025] · As a matting agent in transparent gels or tensiolite: when wet, huntite powder dispersed in liquids remains highly diffusive, i.e. it scatters light inside the liquid and makes it opaque. Moreover, being lamellar and fine, it remains well dispersed and does not re-precipitate. This allows the formulation of translucent or completely opaque gels, shampoos or tensiolite in general, without the use of pigments or acrylic matting agents.

[0026] The same concept can be applied to the formulation of sunscreens containing inorganic filter materials. Metal oxide (titanium dioxide and zinc dioxide) inorganic filter materials are often found in an agglomerated form. The addition of Huntite during the processing of the product results in a more homogenous dispersion of the filter material, allowing for the use of lower rates and improving the overall skin feel of the formulation.

[0027] As an adhesion enhancer: The thin and lamellar shape allows for a higher adhesion to the skin due to the friction between the lamellae and as they slide over the skin. Huntite therefore reduces bleeding and allows for a long-lasting effect to be achieved.

[0028] As a texturizer: Its delicate yet airy formulation features a soft feel that creates a velvety "hands-on" feel upon application. Formulations containing Huntite are less gritty and more creamy upon application, and once absorbed into the skin, the powder on the skin gives a pleasant velvety feel.

[0029] For a soft-focus effect: The fine powder settles between wrinkles, evens out the complexion and evens out the complexion, staying well-adhered without accumulating in skin folds.

[0030] Therefore, according to a preferred embodiment of the present invention, the cosmetic huntite has, in addition to the function of a color enhancer, an additional function as one or more selected from a texturizing agent, a filler, a mattifying agent, a dispersing agent, an adhesion enhancer, and a soft focus effect enhancer. In view of the above, the huntite can be used in many types of cosmetic products, from powders to casts, emulsions, and tensiolite, and can preferably be used as a total or partial replacement for ingredients such as titanium dioxide, talc, mica, or microplastics, the presence of which is undesirable in cosmetic formulations for safety, sustainability, and / or cost reasons. In such products, the huntite performs the same function as the alternative ingredient, while at the same time providing additional benefits due to its multifunctionality.

[0031] For the cosmetic applications of the present invention, the huntite powder has a particle size of from 0.1 μm to 50 μm, preferably from 0.5 μm to 10 μm, or optionally is completely submicron, i.e. 97% of the particles have a particle size below 0.90 μm.

[0032] According to a further aspect thereof, the present invention comprises one or more pigments as defined in claim 6 of the present application and natural huntite powder as a color enhancer. The present invention relates to a cosmetic composition for makeup, characterized in that it contains

[0033] More specifically, the cosmetic product produced using the composition is a lipstick or a concealer, and the composition may preferably contain 3% to 12% by weight of powdered huntite powder as a color enhancer having additional functions as a texturizer and adhesion enhancer.

[0034] In a further embodiment, the cosmetic product produced using the composition is a nail varnish, and the product composition may include 1% to 15% by weight of powdered huntite as a color enhancer.

[0035] In a further embodiment, the product made with the composition is an eye shadow, and the composition may preferably include 1% to 15% by weight of powdered huntite powder as a color enhancer with additional functions as a texturizer and adhesion enhancer.

[0036] In a further embodiment, the product obtained from the composition of the invention is a mattifying compact powder, the composition of which preferably comprises 20% to 35% by weight of powdered huntite as a white pigment, texturizer and soft focus agent.

[0037] Due to its raw material properties, huntite powder can be easily handled like other cosmetic powders. It can be easily dispersed in water or oil using common laboratory and industrial equipment such as turbo emulsifiers and mixers. For optimal results, it can also be passed through a three-cylinder laminator along with other powders in the formulation. Due to the nature of the mineral, huntite can be processed at high temperatures without degradation or other chemical and physical changes.

[0038] Other ingredients used in the formulation of the cosmetic composition according to the invention can include, in addition to the multifunctional ingredient of the invention, all ingredients commonly used in cosmetic formulations, such as structurants, emollients, pigments, texturizers, film formers, preservatives, fillers or carriers, surfactants, rheology modifiers, matting and glossing agents, conditioners, emulsifiers, binders, solvents, UV filters, and others. "Other" is intended as optional secondary ingredients that improve the feel and functionality or stability aspects of the formulation, such as perfumes, flavors, gloss enhancers, active ingredients, antioxidants, chelating agents, stabilizers, pH adjusters, and others. These ingredients are selected according to current cosmetic technology based on the desired properties in the final product. EXAMPLES

[0039] Some specific embodiments of the cosmetic applications of huntite according to the invention are reported below by way of non-limiting examples, together with the corresponding products and including some experimental results.

[0040] Example 1 Pigmented solid lipstick using dispersions of organic and inorganic pigments in diisostearyl maleate. Comparison of formulations with and without huntite. Two solid lipsticks having the compositions shown below were obtained by applying the procedure reported after the table.

[0041] [Table 1]

[0042] These lipsticks can be prepared by heating the Phase A and Phase B ingredients until the wax is completely melted and combining with Phase C ingredients under constant agitation. The product is then poured into lipstick molds at a temperature of 85°C.

[0043] As can be seen from Figure 4, lipstick A.1 according to the invention has a more pronounced blue tint, which is an indication of better pigment development. The release of the pastel is similar, but at the color level, A.1 is more opaque and more vibrant in color. The brightness of the product is also not affected by the use of huntite. Moreover, in tests, the application of A.1 is more homogenous and much smoother than that of A.0.

[0044] It can be concluded that huntite can be effectively used as a texturizer to improve color development and color release and improve the smoothness of pale colors.

[0045] Further experiments on the properties of the resulting lipsticks are presented in the final section of this specification.

[0046] Example 2 Pigmented solid lipstick using pure organic pigments (lakes). A comparison of a formula containing huntite with one containing sericite (mica). Two solid lipsticks having the compositions shown below were obtained by applying the procedure reported after the table.

[0047] [Table 2]

[0048] These lipsticks can be prepared by heating the A and B phase ingredients until the wax is completely melted. The C phase ingredients are added to the molten mass and the whole is rolled in a three-cylinder laminator to obtain a homogeneous paste. The product is poured into lipstick moulds at a temperature of 85°C.

[0049] As can be seen from Figures 5 and 6, the lipstick B.1 according to the invention is darker and smoother on application than lipstick B.0.Huntite therefore improves the ease of application, the uniformity and the color development.It also improves the wear, i.e. the resistance to bleeding.

[0050] As before, it can be concluded that huntite improves color development and color formation, improves product application, and increases adhesion compared to the same formulation containing sericite.

[0051] Example 3 A colored solid concealer using inorganic pigments. Comparison of a formula containing huntite and a formula containing mica. Two solid concealers having the compositions shown below were obtained by applying the procedures reported after the table.

[0052] [Table 3]

[0053] These products can be prepared by heating the A and B phase ingredients until the wax is completely melted. The C phase ingredients are added to the molten mass and the whole is rolled in a three-cylinder laminator to obtain a homogeneous paste. The product is poured into casings at a temperature of 85°C.

[0054] The C.1 version of the concealer according to the invention proved to be easier to work with since the huntite did not increase the viscosity of the product, and as can be seen from Figure 7, the one made with huntite has no color halation, a more homogenous application, a more vibrant and full color, and a better wrinkle-filling effect than sample C.0.

[0055] From a usability point of view, the C.1 version is also softer and easier to apply.

[0056] Example 4 Matte compact powder. Comparison of a formula containing huntite with a formula containing titanium dioxide. Two compact matte powders having the compositions shown below were obtained by applying the procedure reported after the table.

[0057] [Table 4]

[0058] These products are obtained by putting the ingredients of phases A and B into a mill and mixing them until a homogeneous powder is obtained. Then the ingredients of phases C and D are introduced and mixed until homogeneous. The product is then compressed in the bottom of a special press.

[0059] As can be seen from figure 8, product D.1 according to the invention containing huntite is opaque, although not as opaque as the one containing titanium dioxide. It has been found that huntite can be used in powder formulations to obtain a medium coverage product without titanium dioxide.

[0060] Furthermore, upon application, the D.1 product is more fluid and more homogeneous, making it easier to apply to the face. It also has excellent wrinkle filling and soft focus effects.

[0061] Example 6 A pigmented solid lipstick using a pure organic pigment (Red 7 Lake). A comparison of a formula containing Huntite with two formulas without Huntite. Three solid lipsticks having the compositions shown below were obtained by applying the procedure reported after the table.

[0062] [Table 5]

[0063] These lipsticks can be prepared by heating the A and B phase ingredients until the wax is completely melted. The C phase ingredients are added to the molten mass and the whole is rolled in a three-cylinder laminator to obtain a homogeneous paste. It is then heated until completely melted and the D phase ingredients are added. It is then poured into lipstick moulds at a temperature of 85°C.

[0064] Experiments on the properties of the resulting lipstick are presented in the last section of this specification.

[0065] Example 7 Solid lipstick with red iron oxide pigment. A comparison of a formula containing huntite and two formulas without huntite. Three solid lipsticks having the compositions shown below were obtained by applying the procedure reported after the table.

[0066] [Table 6]

[0067] These lipsticks can be prepared in a similar manner to Example 6.

[0068] Experiments on the properties of the resulting lipstick are presented in the last section of this specification.

[0069] Example 8 A solid pearlescent lipstick with red and white pearls. A comparison of a formula with huntite and one without huntite. Two solid lipsticks having the compositions shown below were obtained by applying the procedure reported after the table.

[0070] [Table 7]

[0071] These lipsticks can be prepared in a similar manner to Example 6.

[0072] Experiments on the properties of the resulting lipstick are presented in the final section of this specification.

[0073] Example 9 Dark eyeshadow with red and black iron oxide pigments. Formula with huntite compared to formula without huntite. Two compact powder eyeshadows having the compositions shown below were obtained by applying the procedure reported after the table.

[0074] [Table 8]

[0075] These eyeshadows can be prepared in a similar manner to Example 4.

[0076] Experiments on the properties of the resulting eyeshadows are presented in the final section of this specification.

[0077] Example 10 Brown eyeshadow with red, black, and white iron oxide pigments. Comparison of formulations with and without huntite. Two compact powder eyeshadows having the compositions shown below were obtained by applying the procedure reported after the table.

[0078] [Table 9]

[0079] These eyeshadows can be prepared in a similar manner to Example 4.

[0080] Experiments on the properties of the resulting eyeshadows are presented in the final section of this specification.

[0081] Example 11 Pink eyeshadow made with red and white iron oxide pigments. Comparison of a formula with huntite and one without huntite. Two compact powder eyeshadows having the compositions shown below were obtained by applying the procedure reported after the table.

[0082] [Table 10]

[0083] These eyeshadows can be prepared in a similar manner to Example 4.

[0084] Experiments on the properties of the resulting eyeshadows are presented in the final section of this specification.

[0085] Example 12 A nail polish composition containing huntite. An exemplary nail varnish according to the present invention has the composition shown below.

[0086] [Table 11]

[0087] Instrumental testing of huntite mineral's ability to enhance pigment coloration. To mechanically validate the ability of minerals to enhance pigment coloration, studies were performed on several simple color formulations and the applied colors were evaluated using a Konica Minolta CR-400 portable colorimeter.

[0088] The following make-up formulations were examined: - Lipstick using Red 7 Lake from Example 6 E.0 version without huntite and with 5% pigment E.1 version containing 10% huntite and 5% pigment E.2 version without huntite and with 7.5% pigment Lipstick using the red iron oxide pigment of Example 7 F.0 version without huntite and with 5% pigment F.1 version containing 10% huntite and 5% pigment F.2 version without huntite and with 8.5% pigment Lipstick of Example 1 - A.0 version without Huntite A.1 version containing 5% Huntite - Pearly lipstick using red and white pearls of Example 8 -G.0 version without Huntite -G.1 version containing 10% Huntite - Dark eyeshadow using red and black iron pigments from Example 9 -H.0 version without Huntite -H.1 version containing 5% Huntite - Brown eyeshadow using red, black and white iron oxide pigments of Example 10 -I.0 version without Huntite -I.1 version with 5% Huntite - Pink eyeshadow using red and white iron oxide pigments of Example 11 -L.0 version without Huntite -L.1 version containing 5% Huntite

[0089] A uniform layer of each product was spread onto a white sheet and the colour intensity was assessed by measuring the CIELAB coordinates (L*a*b*).

[0090] Through the CIELAB color space, we can give a numerical value to the perceived color through the coordinates L*, a* and b*, where the coordinates a and b represent two color ranges, green to red and blue to yellow respectively (-a=green, +a=red, -b=blue, +b=yellow), and L represents the luminance and therefore the value of the white color (-L=black, +L=white).

[0091] Tests on Lipsticks E and F of Examples 6 and 7 Lipsticks E and F were prepared according to the following scheme: a control lipstick without huntite; a lipstick similar to the previous lipstick but with huntite to improve color rendition; a lipstick without huntite but with increased pigment to obtain similar color rendition to the version with huntite.

[0092] As the predominant colour in each formulation is red, the a* values ​​were compared, which indicate the intensity of the red colour according to the CIELAB method: the darker the lipstick, the higher the a* value.

[0093] The results are shown in Table 1 below and represented in histogram form in Figure 9 of the accompanying drawings.

[0094] [Table 12]

[0095] As can be seen, the lipstick containing huntite has a higher a* value, which indicates the intensity of the red color, than the reference version without huntite. Lipsticks A.2 and B.2, which contain higher amounts of pigment, show that the use of huntite allows the amount of pigment to be significantly reduced while maintaining the same color rendition.

[0096] Tests on Lipsticks A and G of Examples 1 and 8 Lipsticks A and G of Examples 1 and 8 were prepared in versions with and without Huntite.

[0097] As the predominant colour in each formulation is red, the a* values ​​were compared, which indicate the intensity of the red colour according to the CIELAB method: the darker the lipstick, the higher the a* value.

[0098] The results are shown in Table 2 below and represented in histogram form in Figure 10 of the accompanying drawings.

[0099] [Table 13]

[0100] As can be seen, the lipstick containing huntite has a higher a* value, which indicates the intensity of the red colour, than the reference version without huntite.

[0101] Tests on Eyeshadows H, I and L of Examples 9, 10 and 11 Eyeshadows H, I and L of Examples 9, 10 and 11 were prepared in versions with and without Huntite.

[0102] Since these formulations do not have a single dominant color, we compared the L* values, which indicate the intensity of whiteness according to the CIELAB method: thus, the darker the eyeshadow, the lower the L* value because it is not smeared with white.

[0103] The results are shown in Table 3 below and represented in histogram form in Figure 11 of the accompanying drawings.

[0104] [Table 14]

[0105] As can be seen, the eyeshadow containing huntite has a lower L* value, which indicates the intensity of the white color, than the reference version, which can be inferred to result in a darker eyeshadow and therefore improved color rendering.

[0106] Although the present invention has been disclosed with particular reference to certain specific embodiments thereof, it is to be understood that modifications and variations can be made by those skilled in the art without departing from the scope of protection defined in the appended claims.

Claims

1. Use of huntite powder as a color enhancer, which may have additional functions, in the preparation of cosmetic products for cosmetic use.

2. The use of huntite powder according to claim 1, wherein said huntite powder has additional functions as one or more selected from texturing agent, filler, matting agent, dispersing agent, adhesion enhancer, soft focus effect enhancer.

3. 3. Use of huntite powder according to claim 1 or 2, wherein said huntite powder has a particle size in the range of 0.1 μm to 50 μm.

4. The use of huntite powder according to claim 3, wherein said huntite powder has a particle size in the range of 0.5 μm to 10 μm.

5. 5. Use of huntite powder according to claim 4, wherein said huntite powder is a sub-micrometer powder.

6. A cosmetic composition for makeup comprising 2% to 30% by weight of a powdered color enhancing agent, said color enhancing agent being huntite.

7. 7. The cosmetic composition according to claim 6, wherein said huntite has additional functions as one or more selected from the group consisting of a texturing agent, a filler, a mattifying agent, a dispersing agent, an adhesion enhancer, and a soft focus effect enhancer.

8. 8. A cosmetic composition according to claim 6 or 7, wherein the product made from the composition is a lipstick or a concealer, and the composition comprises 3% to 12% by weight of huntite powder as a colour enhancer with additional functions as a texturizer and deposition enhancer.

9. 8. A cosmetic composition according to claim 6 or 7, wherein the product made from said composition is a powder for eyeshadow compact, said composition comprising 1% to 15% by weight of huntite powder as a colour enhancer with additional functions as a texturizer and deposition enhancer.

10. 8. The cosmetic composition according to claim 6 or 7, wherein the product made from the composition is a nail varnish, and the composition comprises 1% to 15% by weight of huntite powder as a color enhancer.

11. 8. The cosmetic composition according to claim 6 or 7, wherein the product made from the composition is an opaque compact powder, and the composition comprises 20% to 15% by weight of huntite powder as a white pigment, texturizing agent and soft focus enhancer.

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