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).
本文提供了用于角蛋白纤维的
着色剂和角蛋白纤维氧化染色的方法。在一个实施方案中,用于角蛋白纤维的
着色剂按其重量计包括:a) 至少一种选自氧化
染料前体、
直接染料或其混合物组的化合物;b) 至少一种具有 2 至 10 个碳原子的二
羧酸和/或至少一种这种/这些酸的盐,其总量按重量计从约 0.c) 至少一种平均分子量 Mw 在约 2000 至约 7000 道尔顿范围内的角蛋白
水解物, d) 约 20 至约 95%(按重量计)的
水, e) 0 至小于约 0.1%(按重量计)的过氧化物化合物。