| abstract |
Processes for the oxidative dyeing of keratinus fibers with compositions which comprise benzimidazole derivatives as couplers, at least one metaphenylenediaxnine and at least one para or ortho oxidation dye precursor, the benzimidazole derivative corresponding to the formula: <IMAGE> (I) in which: R1 represents a hydrogen atom or a C1-C4 alkyl radical; R2 represents a hydrogen atom or a C1-C4 alkyl radical or a phenyl radical; R3 represents a hydroxyl, amino or methoxy radical; R4 represents a hydrogen atom or a hydroxyl or methoxy or C1-C4 alkyl radical; with the proviso that: when R3 denotes NH2, it occupies position 4; when R3 is at position 4, R4 is at position 7; when R3 is at position 5, then R4 is at position 6. |