Water-soluble copolymers containing units or PONV nlt as inhibitors of color transfer in washing.

USE OF COPOLYMERS HIDROSOLUBLES CONTAINING (A) 5 to 20 mol% N - vinylimidazole ON - OXIDE 4 vinylpyridine, (B) 95 to 50 mole% N - vinylpyrrolidone, N - vinyloxazolidone, METHYL - N - vinylimidazole OR MIXTURES and (C) 0 to 30 mole% other monoethylenically unsaturated monomers, in copolymerized form, and have an average molecular weight MW 50000 ELDERLY; Used as color transfer inhibitors in detergents.