38 results about "Alum" patented technology

An alum (/ˈæləm/) is a type of chemical compound, usually a hydrated double sulfate salt of aluminium with the general formula XAl(SO₄)₂·12H₂O, where X is a monovalent cation such as potassium or ammonium. By itself, "alum" often refers to potassium alum, with the formula KAl(SO₄)₂·12H₂O. Other alums are named after the monovalent ion, such as sodium alum and ammonium alum.