FIELD: methods in inorganic chemistry. SUBSTANCE: to precipitate copper metal on catalytically activated surface, ammonia-free reducing agent is added to cupric ions in aqueous solution, which gives rise to cuprous hydroxide formation with no significant reduction into elementary copper, whereupon cuprous hydroxide is disproportioned to precipitate copper metal. Ammonia-free reducing agent is preferably hydroxylamine or its salts that are used together with water-soluble alkali or alkali-earth metal hydroxide, preferably sodium hydroxide. EFFECT: simplified procedure. 39 cl, 1 tbl
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