配方类型：	METALS
配方说明：	Developing the Color
配方组成：
配制方法：	One or two seconds exposure to a moist ammonia atmosphere will cause the formation of a dense insoluble dye in the unexposed areas of the aluminum. The background sometimes contains a white precipitate. Dyes generally change color with pH. For this reason the final color appears only after the ammonia has completely evaporated.

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