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In a suitable reaction vessel, 1 gram of zinc lactate and 1 gram of zinc tartrate were suspended in 10 ml of water, and the suspension was stirred mechanically. Sufficient ammonium hydroxide was added to the mixture until a clear solution resulted which was then diluted with lactic acid (85%) to produce a solution of ammonium zinc lactate and ammonium zinc tartrate complexes. The solution had a pH of 7 and was odorless. When evaporated under gentle heat in a suitable vessel a solid zinc complex was obtained. The powdered material also was odorless and very soluble in water.

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