Complexes of the formula IMAGE +TR IMAGE and salts thereof, wherein each of R1-R4 is independently hydrogen, halo, nitro, C1-4alkyl, C1-4alkoxy, -NHCOR8, -COX or -SO2Z, wherein R8 is C1-4alkyl or phenyl, X is hydroxy, C1-4alkoxy, phenoxy, substituted phenoxy, phenyl(C1-4alkoxy), substituted phenyl(C1-4alkoxy), C1-4alkyl, phenyl, substituted phenyl, cyclohexyl, cyclohexyl substituted by 1 to 3 C1-4alkyl groups, amino or substituted amino, and Z is -CH2CH2OSO3H, -CH=CH2 or a significance of X with the exception of C1-4alkyl, with the proviso that 1 to 3 of R1-R4 are -SO2Z or at least two of R1-R4 are -COOH, each R5 is independently hydrogen, C1-4alkyl or C1-4alkyl monosubstituted by hydroxy, chloro or cyano, R6 is halo, hydroxy, C1-4alkoxy, phenoxy, amino or substituted amino, and each R7 is independently hydrogen or halo, and mixtures of such complexes each of which is independently in free acid or salt form, are useful for dyeing and printing hydroxy group or nitrogen-containing organic substrates, especially paper, leather and cellulosic textile materials the fastness properties of the obtained dyeings and prints on textile material comprising cellulose fibers may be further improved by after-treating the dyed or printed substrate with a special fixing agent.
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