Potassium Permanganate known by its empirical formula KMnO4, is a salt where in Manganese is in the +7 oxidation state. The permanganate ion is a strong oxidizing agent. It dissolves in water to give deep purple solutions, evaporation of which gives prismatic purple-black glistening crystals. This salt, also known as "permanganate of potash" or "Condy's Crystals".
It forms orthorhombic crystals with constants: a = 9.105, b = 5.720, c = 7.425 Å. The Mn-O bond distances are 1.629 Å. The picture on the right show the tetrahedron of an KMnO4 molecule. Potassium permanganate is recognized by its characteristic purple to pink color when made into a solution. In high concentrations it is a dark purple color.