Oxidation dye

An agent for oxidative dyeing of keratin fibers, said agent comprising a combination of

• at least one 4,5-diaminopyrazole derivative of formula (I), (II) or (III), or a salt thereof with an organic or inorganic acid:
• wherein R1 and R2 each, independently of each other;
• represent hydrogen, a linear or branched C1–C6 alkyl group, an optionally substituted phenyl group or a linear or branched C2–C4-hydroxyalkyl group;
• with the proviso that R1 is not methyl if R2 is hydrogen;
• R3 represents a halogen atom, a linear or branched C1–C4 alkyl group or a linear or branched C1–C4 alkoxy group and R4 represents hydrogen, a linear or branched C1–C4 alkyl group or a linear or branched C2–C4 hydroxyalkyl group;
• R5 represents hydrogen, a linear or branched C1–C6 alkyl group, a C1–C4 hydroxyalkyl group, a C1–C4 aminoalkyl group, a C1–C8 alkylamino group, a di(C1–C8)alkylamino group, a C1–C4 alkylamino-(C1–C4)alkyl group or a di(C1–C4) alkylamino-(C1–C4)alkyl group, an aryl group or a heteroaryl group;
• R6 and R7 may be the same or different and independently of each other, each represent hydrogen, a linear or branched C1–C6 alkyl group, an aryl group, a heteroaryl group, a carboxylic acid group, a carboxylic ester group, an optionally substituted carboxylic acid amide group, a hydroxy group or a C1–C4 hydroxyalkyl group or R2 and R3 jointly form an optionally substituted C1–C6 alkylene group;
• Z is a C1–C10 alkyl diradical, which is optionally interrupted by a hetero atom, an aromatic diradical or a heteroaromatic diradical, which is optionally condensed with one or two benzene rings and/or substituted by a hydroxy group or a C1–C6 alkyl group, or a diradical of formula —Ar(Alk)n—Ar—, in which Ar is an optionally substituted aryl or heteroaryl group, Alk is a —CH2 group and n is a whole number from 0 to 6;
• and x and y, independently of one another are equal to 0 or 1;
• and
• at least one resorcinol derivative, of formula (IV), which is substituted in at a 4 position thereof;
• wherein R8 is a linear or branched C1–C8 alkyl group, a linear or branched C1–C8 hydroxyalkyl group, a linear or branched C1–C4 alkoxy-(C1–C8)alkyl group or a linear or branched C1–C8 aminoalkyl group;
• and
• R9 represent hydrogen, a linear or branched C1–C8 alkyl group, a linear or branched C1–C8 hydroxyalkyl group, a linear or branched C1–C4 alkoxy-C1–C8 alkyl group or a linear or branched C1–C8 aminoalkyl group.