Aluminium potassium sulphate - is a chemical compound: the potassium double sulfate of aluminium. Its chemical formula is KAl(SO4)2 and it is commonly found in its dodecahydrate form as AIK(SO4)2.12H2O.

Potassium aluminium sulfate, also known as potash alum, tawas, and potassium alum, is a chemical compound. Its chemical formula is KAl(SO4)2. It contains potassium, aluminium, and sulfate ions.