| abstract |
The subject of the invention is the use of phenyl-azobenzene compounds comprising at least one cationic group Z, Z being chosen from quaternized aliphatic chains, aliphatic chains comprising at least one quaternized saturated ring and aliphatic chains containing at least one a quaternized unsaturated ring, as direct dyes in compositions intended for dyeing keratin materials and in particular compositions intended for dyeing human keratinous fibers and in particular the hair, the dyeing compositions containing them and the direct dyeing process implementing them. |