Mixtures of a 1:1 copper or nickel complex of a stilbene-azo or stilbene-azoxy compound having two 4,4'-(2,2'-disulfostilbenylene) radicals and a 1:1 copper or nickel complex of a stilbene-azo or stilbene-azoxy compound having one such radical

a mixture consisting essentially of (a) a 1:1 copper complex of a compound of the formula ##STR57## or a salt thereof each cation of which is independently a non-chromophoric cation, and (b) a 1:1 copper complex of a compound of the formula ##STR58## or a salt thereof each cation of which is independently a non-chromophoric cation, wherein

• each A is independently ##STR59## wherein R.sub.1 is hydrogen, halo, C.sub.1-4 alkyl or C.sub.1-4 alkoxy,
• R.sub.2 is hydrogen, halo, C.sub.1-4 alkyl, C.sub.1-4 alkoxy, ureido or (C.sub.1-4 alkyl)carbonylamino,
• R.sub.3 is hydrogen or methoxy, and m is 0, 1 or 2,
• each D is independently ##STR60## wherein R.sub.4 is hydrogen, hydroxy or methoxy,
• R.sub.5 is hydrogen, hydroxy, C.sub.1-4 alkyl, C.sub.2-4 hydroxyalkyl, C.sub.1-4 alkoxy, C.sub.2-4 hydroxyalkoxy or --N(R.sub.14).sub.2,
• wherein each R.sub.14 is independently hydrogen, C.sub.1-4 alkyl or C.sub.2-4 alkyl substituted by 1 or 2 substituents each of which is independently hydroxy, cyano, halo or C.sub.1-4 alkoxy,
• R.sub.6 is hydrogen, C.sub.1-4 alkyl, C.sub.2-4 hydroxyalkyl, C.sub.1-4 alkoxy, (C.sub.1-4 alkyl)carbonylamino, carboxy or sulfo,
• R.sub.7 is hydrogen, hydroxy or methoxy,
• R.sub.8 is hydrogen, carboxy or sulfo,
• R.sub.9 is hydrogen or hydroxy, and
• n is 0, 1 or 2, and
• a and each b is independently 0 or 1,
• wherein the ratio of component (a) to component (b) is 21/3:1 to 1:1.5 by weight.