Permanganic acid
Permanganic acid is an acid. It has the formula HMnO4. It is the acid form of the permanganate ion.
It is often made by reacting dilute sulfuric acid with a permanganate, such aspotassium permanganate. It is not usually a good idea to use concentrated acid because the extra acid may react with the new permanganic acid to create manganese heptoxide, an explosive chemical.