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。
2
This investigation of the mechanism of premixing alum-rosin size for neutral-alkaline papermaking process focused on the mixture solution charge and particle size distribution.