ferric salt or alum 铁盐和铝盐
A salt, such as alum, that ionizes in solution as if it were two separate salts but forms a single substance upon crystallization.
溶解电离时好似是两种不同的盐，结晶时却构成一种物质，如明矾。
To make a sapphire crystal, the basic material used is a salt cleansed from any foreign body (ammoniacal alum).
蓝宝石水晶玻璃的主要原料是一种经过洗涤后除去了所有异物的盐(氨明矾)。
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