FIELD: leather industry. SUBSTANCE: leather half-finished product is treated with solution of modified metacide (polyhexamethyleneguanidine) as nitrogen dye component, after which dry diazonium salt is added. The latter is prepared from sulfanilic acid, p- nitroaniline, and alpha-naphthylamine. EFFECT: intensified dyeing-greasing processes, reduced consumption of water and effort, and improved quality of product. 1 tbl
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