Potassium permanganate has the chemical formula KMnO4 and CAS number 7722-64-7. It forms slender, dark-purple to black orthorhombic crystals with a blue metallic luster. It is non-combustible but is a strong oxidizing agent and may cause combustion or explosion on contact with organic or readily oxidizable substances. It has a sweet, astringent taste, is soluble in water and alkaline solutions, and is slightly soluble in methanol, acetone, and sulfuric acid. Its aqueous solution is reddish purple. It is corrosive and toxic and irritates the skin and mucous membranes. Potassium permanganate is widely used for disinfection, sterilization, water purification, chemical analysis, pharmaceuticals, and organic synthesis, where it functions as an oxidizing, disinfecting, and bleaching agent.