Water-soluble sulphur dyes, their preparation and use

Water-soluble black sulphur dyes of the formula I ##STR8## in which F is the dye chromophore of C.I. Sulphur or Leuco Sulphur Black 1, C.I. No. 53185;

• C.I. Sulphur or Leuco Sulphur Black 2, C.I. No. 53195;
• C.I. Sulphur or Leuco Sulphur Black 5, C.I. No. 53205;
• C.I. Sulphur Black 6, C.I. No. 53295;
• C.I. Sulphur Black 7, C.I. No. 53300;
• C.I. Sulphur or Leuco Sulphur Black 10, C.I. No. 53190;
• C.I. Sulphur Black 11, C.I. No. 53290, or C.I. Sulphur or Leuco Sulphur Black 12, C.I. 53200,
• R.sup.1 is hydrogen or (C.sub.1 -C.sub.4 --) alkyl,
• M.sup..sym. is an alkali metal cation, an ammonium cation of the formula II or mixtures thereof, ##STR9## R.sup.2, R.sup.3, R.sup.4 are hydrogen, (C.sub.1 -C.sub.4) alkyl, (C.sub.2 -C.sub.4) alkenyl, 2-hydroxypropyl, 3-hydroxypropyl, 2,3-dihydroxypropyl, --(CH.sub.2 CH.sub.2 N--H).sub.p --CH.sub.2 CH.sub.2 NH.sub.2, --(CH.sub.2 CH.sub.2 O).sub.m --R.sup.5,2-aminoethyl,2-aminopropyl,3-aminopropyl, or
• 2or 3 of the radicals R.sup.2, R.sup.3, R.sup.4 together with the nitrogen atom to which they are attached form a heterocyclic ring which optionally contain further heteroatoms or heteroatom groupings,
• R.sup.5 is hydrogen or (C.sub.1 -C.sub.4) alkyl,
• p is a number from 1 to 10,
• m is a number from 1 to 10 and
• n is such a large number that dye I contains 5 to 20% by weight of COO.sup..crclbar. groups.