| abstract |
A method of coloring human hair, which comprises contacting, with the organic material, a yellow cationic dye of formula (I) wherein R1 and R2 are each independently of the other a C1-C8 alkyl radical or a radical unsubstituted or substituted benzyl, provided that at least one of the substituents R1 and R2 is an unsubstituted or substituted benzyl radical, R3 is hydrogen, C1-C8 alkyl, C1-C8 alkoxy, cyanide or halide, preferably hydrogen, and X 'is an anion. |