Potassium permanganate (chemical formula: KMnO₄),  cas ：7722-64-7 a strong oxidizing agent, is a purplish-red crystal that is soluble in water. It is reduced when exposed to ethanol.

In the production of chemicals, it is widely used as an oxidizing agent, such as being used as an oxidizing agent for saccharin, vitamin C, isoniazid and camphoric acid; in medicine, it is used as a preservative, disinfectant, deodorant and antidote; in water purification and wastewater treatment, it is used as a water treatment agent to oxidize hydrogen sulfide, phenol, iron, manganese and various pollutants such as organic and inorganic substances, to control odors and decolorization; in gas purification, it can remove trace amounts of sulfur, arsenic, phosphorus, silane, borane and sulfides; in mining and metallurgy, it is used to separate molybdenum from copper, remove impurities from zinc and cadmium, and as an oxidizing agent for compound flotation; it is also used as a bleaching agent for special fabrics, wax, oils and resins, an adsorbent for gas masks, a coloring agent for wood and copper, etc.