A compsn. for oxidn. dyeing of keratin fibres, esp. human keratin fibres, e.g. hair, contains in (1) a suitable medium, (2) 2-amino-3-hydroxypyridine and/or an addn. salt with an acid, as coupler and (3) an oxidn. base comprising (a) a p-phenylene diamine deriv. of formula (I); or an addn. salt with an acid, or (b) a p-aminophenol or an addn. salt with an acid. R1, R2, R3 = H, halogen, 1-4C alkyl, alkoxy, or sulpho-, carboxy- or monohydroxyalkyl, or 2-4C polyhydroxyalkyl; R4, R5 = H, 1-4C (monohydroxy)alkyl, 2-4C polyhydroxyalkyl, (1-4C-alkoxy) (1-4C alkyl), 1-4C carbamylalkyl; 1-4C mesylamino- or acetylamino-alkyl, 1-4C ureidoalkyl, (1-4C carbalkoxy) (1-4C amino-alkyl), 1-4C sulphoalkyl, or 1-4C piperidino- or morpholino- alkyl, or NR4R5 = piperidino or morpholino; provided that at least one of R1-R5 is not H, and if R4 = R5 = H and two of the gps. R1, R2, R3 = H, then the remaining gp. (which is not H) is not Me; and if R4 and R5 are not both H, then R1, R2 and/or R3 = H.
Oxidation dyeing composition for keratinous fibers comprising 2-amino-3-hydroxypyridine and an oxidation base and dyeing process