Patent ID: 6599330
Filing Date: 2003-07-29
Classification: A61K,A61Q

Abstract:
A method for coloring hair and removing the color from the hair when desired, comprising the steps of:(a) coloring the hair with an aqueous hair color composition comprising, in combination: (i) a reducing agent capable of reducing the â€”Sâ€”Sâ€” bonds on the hair fiber surface to form reactive â€”SH groups; and (ii) a dye molecule containing at least one (a) chromophore, and at least one (b) free reactive group selected from the group consisting of â€”SH, thiouronium salts, bunte salts, and mixtures thereof, which dye molecule, upon contact with the hair, reacts with the â€”SH groups on the hair fiber surface to form â€”Sâ€”Sâ€” bonds between the dye molecule and the hair fiber surface when the hair color composition is applied to the hair at ambient conditions; (b) wearing the colored hair for the desired period of time; (c) removing the color applied in step (a) from the hair by contacting the hair with an aqueous based shampoo color removal composition containing a cleansing surfactant and a reducing agent capable of disrupting the â€”Sâ€”Sâ€” bonds between the dye molecule and the hair fiber surface to cause the dye molecule to become disassociated from the hair fiber.