Patent ID: 8702813

Claim:
A method for dyeing keratin-containing fiber comprising applying to the keratin-containing fiber a composition comprising at least one compound of the formula I or II or a salt thereof: wherein R 1 or R 2 each, independently of one another, denote hydroxyl, —O-alkyl, —OC(O)-alkyl, —PO 3 M or —O-glycosyl, alkyl denotes a straight-chain or branched alkyl group having 1 to 10 C atoms, M denotes an alkali or alkaline-earth metal cation or H, R 3 or R 4 each, independently of one another, stand for hydroxyl or a group of the formula III, with the proviso that at least one of the radicals R 3 or R 4 is of the formula III: where * indicates the point of attachment of the formula III group, R 5 to R 9 each, independently of one another, denote H, —OH, a straight-chain or branched alkoxy group having 1 to 20 C atoms, a fluorinated straight-chain or branched alkoxy group having 1 to 20 C atoms, -A, —NH 2 , —NHA, —NA 2 , —NH—(CH 2 —CH 2 —O) n —H, —N[(CH 2 —CH 2 —O) n —H] 2 , —[NHA 2 ]X, —[NA 3 ]X, —SO 3 H, —[SO 3 ]X, 2H-benzotriazol-2-yl or —OC(O)-alkyl, A denotes a straight-chain or branched alkyl group having 1 to 20 C atoms and X is the counterion to the cations [NHA 2 ] + and [NA 3 ] + or the anion [SO 3 ] − .