Agent Name

Aluminum potassium sulfate

Alternative Name

Alum, potassium

CAS Number




Major Category



Alum, potassium; Alaun; Alum; Alum potassium; Alum, N.F.; Aluminum potassium alum; Aluminum potassium disulfate; Aluminum potassium sulfate (AlK(SO4)2); Aluminum potassium sulfate (Kal(SO4)2); Aluminum potassium sulfate, alum; Aluminum potassium sulfate, anhydrous; Burnt alum; Burnt potassium alum; Dialuminum dipotassium sulfate; Exsiccated alum; Potash alum; Potassium alum; Potassium aluminum alum; Potassium aluminum sulfate; Potassium aluminum sulfate (1:1:2); Sulfuric acid, aluminum potassium salt (2:1:1); Tai-Ace K 150; Tai-Ace K 20; [ChemIDplus]


Metals, Inorganic Compounds


White hygroscopic solid; [Merck Index] Colorless odorless crystals; Partially soluble in water; [MSDSonline]


Used in dyeing and printing fabrics; manufacturing dyes, lakes, paper, vegetable glue, marble cement, porcelain cement, explosives, aluminum salts, artificial stones, and statuary; tanning; waterproofing; hardening gelatin; purifying water; clarifying sugar; hardening plaster casts; and electrolytic copper plating; Also used as a catalyst in synthesis of ammonia, a mordant in staining (with carmine, eosine, and hematoxylin), a clarifier (as alumina cream), a hardening agent in microscopy, an additive (matches, paints, baking powder, and foods), a water correcting agent used in brewing industry, an astringent, a veterinary antiseptic and antimycotic, and in taxidermy; [HSDB] Used as a coagulating agent for latex and as a styptic pencil; [CHEMINFO] Potassium aluminum sulfate (alum) is used as a hardener in photographic processing; Also used as a mordant in textile dyeing (textile arts); []


An irritant; [MSDSonline] See "Aluminum potassium sulfate dodecahydrate." See "Aluminum."

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