Abstract: The preparation for dyeing keratin fibers contains, in a cosmetic carrier, a combination of at least one 4,5-diaminopyrazole derivative of formula (I), or a physiologically compatible salt thereof. in which R is an alkyl group, a monohydroxyalkyl group, a polyhydroxyalkyl group, a monoaminoalkyl group, a polyaminoalkyl group, an unsubstituted benzyl group or a substituted benzyl group substituted with a halogen, an alkyl group or an alkoxy group; and at least one phenylurea derivative of formula (II), or a physiologically compatible salt thereof, in which R1 represents a hydroxyl or alkoxy group and R2 represents a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, a hydroxyalkyl group or polyhydroxyalkyl group, each with up to 6 carbon atoms. A method of hair dyeing with this preparation is described.

Abstract: The present application relates to a preparation for dyeing keratin fibers which, before use, is mixed with an oxidizing agent and wherein a combination of