Patent ID: 7601180

Claim:
A method for dyeing and lightening human keratin substances, comprising applying to the human keratin substances at least one composition for dyeing human keratin substances with lightening effect, comprising, in a cosmetically acceptable medium, at least one fluorescent cyanine dye chosen from compounds of formula (I), compounds of formula (II), and salts thereof: wherein: linker represents a saturated or unsaturated, aliphatic or alicyclic C 1 -C 12 hydrocarbon chain, wherein at least one of the carbons of the hydrocarbon chain is optionally replaced by at least one entity chosen from oxygen and NR wherein R is hydrogen or an alkyl, and further wherein the hydrocarbon chain comprises no diazo, nitro, nitroso, or peroxide groups, and the hydrocarbon chain terminates at at least one end with a carbon atom; R1represents a linear C 1 -C 8 alkyl optionally substituted in a terminal position by hydroxy or alkoxy; R2 represents hydrogen; halo; alkyl; alkoxy; amino optionally substituted by at least one C 1 -C 4 alkyl optionally substituted by at least one hydroxyl; R3 represents a linear C 1 -C 8 alkyl optionally substituted in a terminal position by hydroxyl or alkoxy; or two R3 form, together with the linker and the nitrogens to which they are attached, a 6- or 7-membered saturated heterocycle of formula: wherein n is 1 or 2; and X − represents a counterion.