A two-stage process for dyeing keratin fibres, especially human hair, which comprises applying a first composition containing at least one mercaptan present in a concentration insufficient to causes degradation of the hair and subsequently without intermediate rinsing, applying an oxidising composition so as to develop the dyestuff, and optionally one or more couplers, which is applied to the fibres, the dyestuff being an oxidative dyestuff precursor of the para type, a diphenylamine, a polyhydroxybenzene, a polyhydroxynaphthalene, a polyaminobenzene, a polyaminophenol or a polyaminopolyhydroxybenzene is described and compositions for use therein.
一种用于染色角蛋白纤维,特别是人类头发的两阶段处理过程,包括施加第一种含有至少一种巯基物质的组合物,其浓度不足以导致头发降解,随后在无中间冲洗的情况下,施加氧化组合物以发展
染料,可选地,还可以使用一个或多个
偶联剂,该组合物施加于纤维上,
染料是一种对位型氧化
染料前体,
二苯胺,多羟基苯,多羟基
萘,多
氨基苯,多
氨基
酚或多
氨基多羟基苯,以及用于其中的组合物。