配方类型：	METALS AND THEIR TREATMENT
配方说明：	Coloring Copper Gray
配方组成：	Immersion time/5 to 10 sec. If you want a scratch-brushed finish, immerse the part in the arsenic trioxide solution, rinse, brush wet, and re-immerse for recoloring. The coating is a displacement film of arsenic which has relatively little resistance to abrasion. Formula No. Ferric chloride (6H4O) or ferric sulfate (9H2O)/15 oz/gal Immersion time/10 sec. Hydrochloric acid (35%)/1 gal Arsenic trioxide/13 to 14 oz/gal Arsenic trioxide/4 oz/gal Hydrochlori

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