Patent ID: 10293191

Abstract:
Coloring agents for keratin fibers and methods for the oxidative dyeing of keratin fibers are provided herein. In an embodiment, a coloring agent for keratin fibers includes, based on its weight, a) at least one compound selected from the group of oxidation dye precursors, direct dyes, or mixtures thereof, b) at least one dicarboxylic acid having 2 to 10 carbon atoms and/or at least one salt of this/these acid(s) in a total quantity of from about 0.1 to about 5% by weight, calculated respectively on the undissociated dicarboxylic acid and based on the weight of the coloring agent, c) at least one keratin hydrolyzate having an average molecular weight Mw in the range from about 2000 to about 7000 daltons, d) from about 20 to about 95% by weight of water and e) from zero to less than about 0.1% by weight of peroxide compound(s).