4,5-diaminoimidazoles as novel developer-type oxidation dye precursors

An agent for oxidative changing of the color of keratin fibers, in particular human hair, including, in a cosmetic support, as a developer-type oxidation dye precursor, at least one compound of formula (I)

• wherein
• R1, R2 independently of one another stand for hydrogen, a C1-C6 alkyl group, a C2-C6 alkenyl group, a hydroxy C1-C6 alkyl group, a polyhydroxy C2-C6 alkyl group, a C1-C6-alkyloxy C2-C6 alkyl group, an amino C1-C6 alkyl group, a polyamino C2-C6 alkyl group, a di(C1-C6-alkyl)amino C1-C6 alkyl group, a C1-C6 alkanoyl group, an aryl group or an aryl C1-C6 alkyl group,
• R3, R4 independently of one another stand for hydrogen, a C1-C6 alkyl group, a C2-C6 alkenyl group, a hydroxy C1-C6 alkyl group, a polyhydroxy C2-C6 alkyl group, a C1-C6-alkyloxy C2-C6 alkyl group, an amino C1-C6 alkyl group, a polyamino C2-C6 alkyl group, a di(C1-C6-alkyl)amino C1-C6 alkyl group, a C1-C6 alkanoyl group, an aryl group or an aryl C1-C6 alkyl group,
• R5, R6 independently of one another stand for hydrogen, a C1-C6 alkyl group, a C2-C6 alkenyl group, a hydroxy C1-C6 alkyl group, an aryl group or an aryl C1-C6 alkyl group,
• and/or a physiologically compatible salt thereof.