配方类型：	METALS AND THEIR TREATMENT
配方说明：	Coloring copper Golden Yellow
配方组成：	Nitric acid (1.42 sp gr)/2.5 fl oz/gal Wetting agent such as sodium lauryl sulfate/0.1 oz/gal Hydrochloric acid (1.20 sp gr)/0.75 fl oz/gal Temperature/70 to 80F Sodium dichromate/20 oz/gal Immersion time 1 min. Sulfuric acid (1.84 sp gr)/0.4 fl oz/gal

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