Copper sulfate pentahydrate is also known as copper sulfate crystal. In order to distinguish it from anhydrous copper sulfate, it is usually read as "copper sulfate pentahydrate" with a relative molecular weight of 250. Commonly known as blue alum, bile alum, copper alum and gallstone.
Potassium aluminum sulfate dodecahydrate, common name: alum, potassium alum, is a double salt of potassium sulfate and aluminum sulfate containing crystallization water.