配方类型：	COSMETICS
配方说明：	Pewter Plating
配方组成：
配制方法：	Immersion in a solution of 10% sulfuric acid containing 1-2% concentrated nitric acid will produce a patina similar to that resulting from 2 or 3 years exposure in a normal atmosphere. The surface of the pewter should be thoroughly clean and free from grease before immersion in the solution for between 30 and 240 sec, depending on the depth of patina required.

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