Patent ID: 7326255

Claim:
A process for dyeing human keratin fibers, comprising applying to the keratin fibers a composition comprising at least one latent pigment, wherein said at least one latent pigment is soluble in a medium that is suitable for dyeing, and then chemically, thermally or photochemically converting the latent pigment in the keratin fibres into a water-insoluble pigment wherein the at least one latent pigment is chosen from those of formula (I): A(B)x (I) wherein: x is an integer ranging from 1 to 8, A is the chromophoric radical of dyes comprising a hetero atom chosen from N, O and S, wherein when x is equal to 1, B is chosen from groups of formula (II), when x is greater than 1, B is chosen from a hydrogen atom and groups of formula (II), with the proviso that when x is greater than 1, B is at least once a group of formula (II): wherein Z is chosen from cationic water-solubilizing groups Z + and polyethylene glycol residues, Y is a hetero atom chosen from N, O and S, F and F′ which can be identical or different, are chosen from linear and branched C 1 -C 14 alkylene chains, which can optionally comprise hetero atoms and can optionally be substituted with at least one entity chosen from hydroxyl radicals, amino radicals, and halogens, n, m and m′, which may be identical or different are chosen from zero and 1, and B is linked to a hetero atom of the chromophore A.