Process for washing off prints or dyeings on cellulosic textile materials

A process for washing prints or dyeings produced with reactive dyes on cellulosic fibre materials, which comprises dyeing said fibre materials in the presence of 0 to 20 g per liter of a salt of a mineral acid and at least one reactive dye of formula ##STR48## wherein A.sub.1 is the radical of a a monoazo, polyazo, metal complex azo, anthraquinone, phthalocyanine, formazan, azomethine, dioxazine, phenazine, stilbene, triphenylmethane, xanthene, thioxanthone, nitroaryl, naphthoquinone, pyrenequinone or perylenetetracarbimide dye, A.sub.2 independently of A.sub.1 has the meaning of A.sub.1 or is hydrogen or is a colourless organic radical, R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are each independently of one another hydrogen or unsubstituted or substituted C.sub.1 -C.sub.4 alkyl, B is an aliphatic or aromatic linking group, and Y.sub.1 and Y.sub.2 are each independently of the other fluoro or carboxypyridinium;

• or ##STR49## wherein D is the radical of a diazo component, Q is an unsubstituted or substituted phenyl or naphthyl radical, or an unsubstituted or substituted aromatic-heterocyclic radical, and V.sub.1 and V.sub.2 are each independently of the other a radical of formula ##STR50## wherein R.sub.5 and R.sub.6 are each independently of the other hydrogen, unsubstituted or substituted aryl or unsubstituted or substituted C.sub.1 -C.sub.6 alkyl, and alkyl, with the exception of methyl, may be interrupted by --O-- or --NR'--, and R' is hydrogen or C.sub.1 -C.sub.4 alkyl, or NR.sub.5 R.sub.6 form a heterocyclic 5- or 6-membered ring which is unsubstituted or further substituted, with the proviso that at least one of V.sub.1, V.sub.2 and D carries a fibre-reactive group, and subsequently treating the dyed fibre materials in an aqueous wash liquor with 0.5 to 2 g/l of a washing-off formulation consisting essentially of
• (a) 10 to 25% by weight of a polyvinyl pyrrolidone homopolymer having an average molecular weight of 2,500 to 750,000,
• (b) 90 to 75% by weight of anhydrous sodium metasilicate or sodium metasilicate-5- or -9-hydrate, and
• (c) 0 to 1% by weight of a dust inhibitor,
• in the temperature range from 60.degree. to 100.degree. C.