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A device for packaging and distributing at least first and second cosmetic compositions, which are different from each other and which may be mixed together for the purpose of applying them to keratin materials may be configured to separately store the first and second compositions. The device may i

A device for packaging and distributing at least first and second cosmetic compositions, which are different from each other and which may be mixed together for the purpose of applying them to keratin materials may be configured to separately store the first and second compositions. The device may include a regulating member configured to allow a user to vary a relative proportion of at least one composition in the mixture, the relative proportion conditioning at least one visible optical effect other than color in the mixture.

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What is claimed is: 1. A process for preparing a cosmetic composition for the purpose of applying the composition to keratin material comprising mixing together at least a first cosmetic composition and a second cosmetic composition, which are different from each other and separately stored in a de

What is claimed is: 1. A process for preparing a cosmetic composition for the purpose of applying the composition to keratin material comprising mixing together at least a first cosmetic composition and a second cosmetic composition, which are different from each other and separately stored in a device for packaging and distributing the cosmetic composition, said device comprising a regulating member configured to allow a user to vary a relative proportion of at least one of said first and second cosmetic compositions the obtained mixture, the relative proportion conditioning at least one visible optical effect other than color in the mixture. 2. Process according to claim 1, wherein the second cosmetic composition is configured to produce the at least one optical effect with a variable degree as a function of a proportion thereof in the mixture. 3. Process according to claim 2, wherein the second cosmetic composition is configured to produce the at least one optical effect with varying degrees perceptible by the human eye as a function of a proportion thereof in the mixture. 4. Process according to claim 3, wherein the second cosmetic composition comprises particles that contribute toward the at least one optical effect in the mixture. 5. Process according to claim 4, wherein the first cosmetic composition is free of coloring agent and wherein the second cosmetic composition comprises a nacre. 6. Process according to claim 4, wherein the first cosmetic composition is free of coloring agent and wherein the second cosmetic composition comprises at least one coloring agent and a nacre. 7. Process according to claim 4, wherein the first cosmetic composition comprises a coloring agent and wherein the second cosmetic composition comprises at least one nacre. 8. Process according to claim 4, wherein the first cosmetic composition is free of coloring agent and wherein the second cosmetic composition comprises at least one filler and a coloring agent. 9. Process according to claim 4, wherein the first cosmetic composition comprises a coloring agent and wherein the second cosmetic composition comprises a filler. 10. Process according to claim 3, wherein the second cosmetic composition comprises a phase that contributes toward the at least one optical effect in the mixture. 11. Process according to claim 10, wherein the at least one optical effect comprises coverage. 12. Process according to claim 10, wherein the at least one optical effect comprises variation of color as a function of an angle of observation. 13. Process according to claim 12, wherein the second cosmetic composition comprises a goniochromatic coloring agent. 14. Process according to claim 13, wherein the goniochromatic coloring agent is selected from an interference multilayer structure and a liquid-crystal coloring agent. 15. Process according to claim 12, wherein the first cosmetic composition is free of coloring agent and wherein the second cosmetic composition comprises at least one goniochromatic coloring agent. 16. Process according to claim 15, wherein the first and second cosmetic compositions are distributed separately. 17. Process according to claim 10, wherein the at least one optical effect comprises diffraction of light. 18. Process according to claim 17, wherein the second cosmetic composition comprises a diffractive pigment. 19. Process according to claim 10, wherein the at least one optical effect comprises inhomogeneity of an appearance of the mixture. 20. Process according to claim 19, wherein the second cosmetic composition comprises reflective particles. 21. Process according to claim 19, wherein the second cosmetic composition comprises at least one of flakes and fibers that are visible to the naked eye. 22. Process according to claim 19, wherein the second cosmetic composition comprises an oily phase. 23. Process according to claim 10, wherein the at least one optical effect comprises gloss. 24. Process according to claim 23, wherein at least one of the first and second cosmetic compositions comprises a coloring agent. 25. Process according to claim 24, wherein the first cosmetic composition and the second cosmetic composition each comprise at least one coloring agent. 26. Process according to claim 25, wherein the first and second cosmetic compositions comprise a same coloring agent in different concentrations. 27. Process according to claim 25, wherein the first and second cosmetic compositions each comprise several pigments and wherein relative proportions of the pigments among each other are substantially equal between the first and second cosmetic compositions. 28. Process according to claim 24, wherein the coloring agent is selected from the group consisting of a mineral pigment, an organic pigment, an organic lake, a nacreous pigment, a composite pigment, a liposoluble dye, a water-soluble dye, and mixtures thereof. 29. Process according to claim 28, wherein the second cosmetic composition comprises at least one filler. 30. Process according to claim 29, wherein the filler is selected from the group consisting of talc, mica, silica, kaolin, sericite, polyamide powder, polyolefin powder, polyethylene powder, polytetrafluoroethylene powder, polymethyl methacrylate powder, polyurethane powder, starch powder, and silicone resin beads. 31. Process according to claim 1, wherein at least one of the first and second cosmetic compositions is free of coloring agent. 32. Process according to claim 1, wherein the first and second cosmetic compositions are free of UV-screening agent. 33. Process according to claim 1, wherein the device is configured to allow the first and second cosmetic compositions to be mixed inside the device. 34. Process according to claim 1, wherein the regulating member is rotary. 35. Process according to claim 1, wherein the regulating member comprises at least two positions corresponding to different relative proportions of the first cosmetic composition and the second cosmetic composition in the mixture. 36. Process according to claim 1, wherein the regulating member is configured to allow a user to distribute one of the first and second cosmetic compositions alone. 37. Process according to claim 1, wherein the regulating member is configured to allow a user to distribute the first cosmetic composition alone or the second cosmetic composition alone. 38. Process according to claim 1, wherein the regulating member is configured to allow continuous setting of a proportion of one of the first and second cosmetic compositions in the mixture. 39. Process according to claim 1, wherein the regulating member is configured to allow setting in increments of a proportion of one of the first and second cosmetic compositions in the mixture. 40. Process according to claim 1, wherein the device is configured to simultaneously distribute the first and second cosmetic compositions. 41. Process according to claim 1, wherein the regulating member comprises at least two successive regulating positions and wherein a variation in color of the mixture between the two successive positions is not greater than about 0.8. 42. Process according to claim 41, wherein a course between two successive positions represents less than a quarter of a total course of the regulating member. 43. Process according to claim 1, wherein a variation in color of the mixture between two extreme positions of the regulating member is not greater than about 2. 44. Process according to claim 1, wherein the device is configured to deliver at least one item of information concerning the relative proportion of the first and second cosmetic compositions in the mixture as a function of a setting selected by a user. 45. Process according to claim 1, wherein the device is configured to give at least one item of information regarding at least one optical property of the mixture as a function of a setting selected by a user. 46. Process according to claim 45, wherein the device is not provided with an applicator for application of the mixture. 47. Process according to claim 46, wherein the device comprises at least one pump for distributing at least one of the first and second cosmetic compositions and the mixture. 48. Process according to claim 1, wherein the device comprises an applicator for applying the mixture. 49. Process according to claim 48, wherein the applicator comprises an at least partially elastically deformable structure. 50. Process according to claim 1, wherein at least one of the first and second cosmetic compositions is contained in a removable container of the device. 51. Process according to claim 50, wherein the device is combined with a plurality of different compositions that may be used as the first cosmetic composition. 52. Process according to claim 50, wherein the device is combined with a plurality of different compositions that may be used as the second cosmetic composition. 53. Process for making up a keratin material, comprising: applying to the keratin material a mixture prepared by mixing together at least a first cosmetic composition and a second cosmetic composition, which are different from each other and separately stored in a device for packaging and distributing the cosmetic composition, said device comprising a regulating member configured to allow a user to vary a relative proportion of at least one of said first and second cosmetic compositions in the obtained mixture, the relative proportion conditioning at least one visible optical effect other than color in the mixture. 54. Process according to claim 53, comprising: setting the regulating member to a first setting; making up a first area of the keratin material with the mixture according to the first setting; setting the regulating member to a second setting different from the first setting; and making up a second area of the keratin material with the mixture according to the second setting. 55. Process according to claim 53, comprising: choosing a visual result; setting the regulating member to a setting aimed at obtaining the chosen visual result; and making up an area of at least one of skin, lips and integuments with the mixture according to the setting. 56. Process according to claim 53, wherein the mixture is applied to the skin, the lips, or the nails.