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A method for producing finely divided stable cupric hydroxide composition of low bulk density comprising contacting solutions of an alkali metal carbonate or bicarbonate and a copper salt, precipitating a basic copper carbonate－basic copper sulfate to a minimum pH in the range of greater than 5 to a

A method for producing finely divided stable cupric hydroxide composition of low bulk density comprising contacting solutions of an alkali metal carbonate or bicarbonate and a copper salt, precipitating a basic copper carbonate－basic copper sulfate to a minimum pH in the range of greater than 5 to about 6, contacting the precipitate with an alkali metal hydroxide and converting basic copper sulfate to cupric hydroxide, within the pH range of 7 to 11.

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The method of producing stable cupric hydroxide－cupric carbonate composition comprising the steps of: (a) adding a 0.5 to 2 molar aqueous solution of copper sulfate salt to an aqueous solution of 1 to 6 moles of alkali metal carbonate solution thereby forming a precipitate of basic copper carbonate

The method of producing stable cupric hydroxide－cupric carbonate composition comprising the steps of: (a) adding a 0.5 to 2 molar aqueous solution of copper sulfate salt to an aqueous solution of 1 to 6 moles of alkali metal carbonate solution thereby forming a precipitate of basic copper carbonate and basic copper sulfate mixture, until the pH of the resulting mixture is in the range of greater than 5 to about 6 with carbon dioxide evolution beginning about pH 8.5; (b) adding an aqueous solution of alkali metal hydroxide to the mixture of step (a) to a pH in the range of about 10.0 to about 10.8, to form a solid cupric hydroxide－cupric carbonate composition and (c) recovering and drying solid cupric hydroxide－cupric carbonate composition, said recovered and dried solid cupric hydroxide－cupric carbonate composition having a particle size of less than 1.0 micrometers.