Patent ID: 7641702

Claim:
An agent for the oxidative coloring of keratin fibers based on a developer substance-coupler substance combination comprising at least one o-aminophenol derivative of the formula (I) or physiologically compatible, water-soluble salts thereof, in which X is oxygen, sulfur or N—R4; R1, R2, R3 may be identical or different and, independently of one another, are hydrogen, a halogen atom, a cyano group, a C 1 -C 4 -alkoxy group, a C 1 -C 6 -alkyl group, a C 1 -C 4 -alkyl thioether group, a mercapto group, a nitro group, a trifluoromethane group, a —C(O)H group, a —C(O)CH 3 group, a —C(O)CF 3 group, an —Si(CH 3 ) 3 group, a C 1 -C 4 -hydroxyalkyl group or an aminomethyl group; and R4 is hydrogen, a C 1 -C 6 -alkyl group, a C 1 -C 4 -hydroxyalkyl group, a phenyl group or an acetyl group.