Preparation of 1:2 chromium complexes one sulfo substituted and one sulfonamido or the like substituted azo dyes

A process for the preparation of asymetric 1:2 chronium complex dyes which are at least 85% pure and contain at least two groups which impart solubility in water, which process comprises reacting a mixture of two dyes of the formulae ##STR15## in which D and D' independently of one another are each a diazo component benzene or naphthalene radical containing a hydroxyl or carboxyl group in the o-position relative to the azo group, K--XH and K'--X'H independently of one another are each

• a) a radical of the formula ##STR16## in which the phenyl radical (a) is unsubstituted or is substituted by C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy, nitro or halogen, or
• b) a radical of the formula ##STR17## in which the group --OH is in the o-position relative to the azo group and R.sub.3 is 0 to 3 substituents selected from the group C.sub.1 -C.sub.4 alkyl, halogen, C.sub.2 -C.sub.4 alkanoylamino, benzoylamino, C.sub.1 -C.sub.2 alkylsulfonylamino or phenylamino which is unsubstituted or substituted by methyl, methoxy or chlorine, Y is amino which is unsubstituted or monosubstituted or disubstituted by C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 hydroxyalkyl, cyclohexyl, C.sub.7 -C.sub.12 aralkyl and/or phenyl which is unsubstituted or substituted by C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy, halogen or nitro, or is phenoxy which is unsubstituted or substituted by C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy, halogen or nitro, or is C.sub.1 -C.sub.4 alkyl, t is 1 or 2, p and q independently of one another being 0 or 1, and the radical D or K carries the sulfo group(s) and the radical D' or K' carries the --SO.sub.2 -- Y group, in a molar ratio of 0.85:1.0 to 1.2:1.0 in a one-pot process with a chronium donor under pressure at a temperature above 100.degree. C. and at a pH between 0 and 2, and then continuing the reaction at a slightly acid, neutral or slightly alkaline pH.