The invention relates to a process for dyeing keratinous fibres, which consists in applying to these fibres a composition containing, in a suitable medium for dyeing, at least one coupler of formula: ##STR1## where R.sub.1 denotes hydrogen or alkyl, R.sub.2 and R.sub.3 denote hydrogen, alkyl, COOR' where R' is alkyl or hydrogen, at least one of the groups R.sub.2 and R.sub.3 denoting hydrogen, R.sub.4 denotes hydrogen, alkyl, hydroxyalkyl, polyhydroxyalkyl or aminoalkyl, Z.sub.1 and Z.sub.2 denote hydrogen, alkyl, hydroxyl, halogen, alkoxy, at least one of the groups Z.sub.1 and Z.sub.2 is other than hydrogen at least one oxidation dye precursor, at least one oxidizing agent, the pH of the composition applied to the fibres being higher than 7.
该发明涉及一种染色角蛋白纤维的方法,包括将含有至少一种配对剂的组合物施加到这些纤维上,所述配对剂的
化学式为:其中R₁代表氢或烷基,R₂和R₃代表氢、烷基、COOR'(其中R'代表烷基或氢),R₂和R₃中至少有一个代表氢,R₄代表氢、烷基、羟基烷基、多羟基烷基或
氨基烷基,Z₁和Z₂代表氢、烷基、羟基、卤素、烷氧基,其中Z₁和Z₂中至少有一个不是氢,至少含有一种氧化
染料前体,至少一种氧化剂,施加到纤维上的组合物的pH值高于7。