| abstract |
Agent for dyeing keratin fibers, characterized in that it consists of an at least one tryptophan derivative of the general formula (I) and optionally component (A) containing pyridoxal phosphate and a component (B) containing a tryptophanase enzyme and optionally pyridoxal phosphate, the Tryptophanase enzyme and the pyridoxal phosphate can also be packaged separately from one another, DOLLAR F1 and in the formula (I) X is N or a CR4 group, R is hydrogen or a C1 to C4 alkyl group, and R1 to R4 may be the same or different and independently of one another hydrogen, a straight-chain or branched alkyl group having 1 to 6 carbon atoms, an aryl group, a difluoromethyl group, a trifluoromethyl group, a halogen atom (fluorine, chlorine, bromine or iodine), an amino group, a C1 bis C6-alkylamino group, an arylamino group, a hydroxy group, an alkoxy group having 1 to 4 carbon atoms, an aryloxy group, a nit ro group, a carboxy group, a carboxyalkyl group, a carboxamido group, a carboalkoxy group, a carboaryloxy group or a heterocyclic radical, or R1 and R2 or R2 and R3 form a methylenedioxy group; and methods of dyeing fibers using this agent. |