Potassium aluminium sulfate
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.
It is a white solid. It is acidic. It reacts with sodium bicarbonate to make carbon dioxide gas. It does exist naturally.
It is made by reacting aluminium sulfate with potassium sulfate.
It is used to purify water. It is also used in deodorants. It is an antiseptic. It had several uses in the past, such as in dying clothes.