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US 12,661,312 B2Granted
Process for dyeing keratin materials using a direct dye and an unsaturated heterocyclic salt, and composition comprising same
AssigneeL'oreal
InventorsStéphane Sabelle, Olivier Guerard
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Abstract
The present invention relates to a cosmetic process for treating keratin materials, in particular keratin fibers, preferably human keratin fibers such as the hair, using a) one or more direct dyes and b) one or more particular heterocyclic salts, to a composition comprising ingredients a) and b) and to a kit comprising a) and b).
Claims20
A method for dyeing keratin materials, comprising applying onto the keratin materials, simultaneously or separately:
- (a) at least one direct dye comprising at least one of compounds (a-A) through (a-G), salts thereof, isomers thereof, solvates thereof, or mixtures thereof:
- and
- (b) at least one compound comprising at least one of compounds (b-1) through (b-40), optical, geometrical, or tautomeric isomers thereof, solvates thereof, or mixtures thereof:
- wherein Y− represents an anionic counterion, and
- wherein the at least one direct dye (a) and the at least one compound (b) are applied to the keratin materials in a total amount per gram of keratin materials effective to enhance color build-up.
2 more elements
Dependencies are inferred from the claim text.