配方类型：	METALS
配方说明：	Vat Etching of Aluminum Lithographic Plates
配方组成：
配制方法：	Immerse plates in cold 6% solution of caustic potash for 2 minutes. Rinse in cold water. Immerse in 1.5% solution of sodium carbonate at 188F for 12 minutes. Rinse in cold water. Dip into mixture of 1 part glacial acetic acid and 35 parts of water for a few seconds. Rinnse in cold water, while brushing off the sludge, and dry.

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