FIELD: textile industry. SUBSTANCE: stained cotton fabric is impregnated with aqueous solution of precondensate of tetrakis-(hydroxymethy)-phosphonium and urea, dried and hardened in gaseous ammonia flow. Before impregnation and after hardening fabric is treated additionally with aqueous solution of di-1,3-N, N, N′-hydroxymethyl-4,5-dihydroxyethyleneurea in the presence of mineral acid to provide pH 1.7, not above. Addition treatment can be performed with fabrics containing 57-80% moisture. EFFECT: improved method of fabric modification. 24 tbl
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