abstract |
Agents for the oxidative dyeing of hair based on a developer-coupler combination containing as the developer a 4,5-diaminopyrazole derivative of general formula (I) in which R<1> is halogen, C1-C4 alkyl, C1-C4 alkoxy and R<2> is hydrogen, C1-C4 alkyl, C2-C4 hydroxyalkyl, or their physiologically acceptable, water-soluble salts, and novel 4,5-diaminopyrazole derivatives. |