| abstract |
A method for dyeing keratin-containing fibers comprising treating the fiber with at least one dye of formula ** Formula ** its salts, hydrates and other solvates, wherein R1 is hydrogen; C1-C12 alkyl which may be substituted with one or more C1-C5 alkyl, C1-C5 alkoxy, hydroxy, or - (CO) -H; - (CO) -C1-C5 alkyl; phenyl or phenyl-C1-C4 alkyl, wherein the phenyl moiety may be substituted with one or more C1-C5 alkyl, C1-C5 alkoxy, halogen, -NH2, mono-C1-C5 alkylamino, di-C1-C5 alkylamino , -NO2, carboxyl or hydroxyl; X is selected from biphenylene, ethylene, n-propylene, 2,2-dimethylpropylene; n-hexylene; or the bivalent radical - (CH2) 2-S-S- (CH2) 2-; R3 is hydrogen; C1-C12 alkyl; C2-C14 alkenyl; C6-C12 aryl; C6-C12 aryl-C1-C12 alkyl; or C1-C12 alkyl-C6-C12 aryl; Y is an anion; and n is a number from 2-100. |