配方类型：	METALS AND THEIR TREATMENT
配方说明：	Coloring Copper Blue
配方组成：	Gelatin/0.5 oz/gal Cathode current density/1.5 to 4 A/ft^2 Copper acetate/1.5 oz/gal Formula No. Sodium thiosulfate/8 oz/gal Lead acetate/4 oz/gal Temperature/200F Immersion time/30 to 60 sec.
配制方法：	At temperatures below about 170F, thin yellow, green, or red films are obtained, depending on the immersion time. With an addition of potassium.

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