The present disclosure concerns colouring agents for keratinous fibres, in particular for human hair, which—with respect to its weight—contain at least one compound selected from the group formed by oxidative dye precursors, direct dyes and mixtures thereof, from about 0.1 to about 5% by weight of dicarboxylic acid(s) containing from about 2 to about 10 carbon atoms and/or salt(s) of this(these) acid(s), from about 20 to about 95% by weight of water, and less than about 0.1% by weight of peroxy compound(s), to produce oxidative colouring agents with improved protection of fibres.
                            本公开涉及用于角质纤维,特别是人类头发的
着色剂,就其重量而言,该
着色剂含有至少一种选自氧化
染料前体、
直接染料及其混合物所组成的组的化合物,约 0.1%至约 5%(按重量计)的含约 2 至约 10 个碳原子的二
羧酸和/或这种酸的盐,约 20%至约 95%(按重量计)的
水,以及少于约 0.1%(按重量计)的过氧化合物,以生产出对纤维有更好保护作用的氧化
着色剂。