| 摘要 |
The invention relates to an agent for dying keratin fibers, especially human hair. The inventive agent contains a naphthyl-azo compound with formula (I), in which R<1> represents hydrogen, halogen, hydroxy, nitro, a C1-C4-alkyl group, a C1-C4-alkoxy group, sulfo group or carboxy group; R<2> represents a 1- or 2-naphthyl group which comprises at least one hydroxy group and, as additional substituents, can comprise hydroxy groups, sulfo groups, carboxy groups, nitro groups or halogen atoms, or represents a 1-aryl-5-hydroxy-4-pyrazolyl radical which can be substituted in position 3 by a C1-C4-group; M represents hydrogen, an alkali metal or 1/2 alkaline earth metal, 1/3 Al(III), 1/2 Zn(II), 1/4 Ti(IV), 1/4 Zr(IV), 1/3 Cr(III), 1/2 Co(II), 1/2 Fe(II), 1/3 Mo(III) or 1/6 Mo(VI), 1/3 W(III) or 1/6 W(VI) or ammonium.
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