Manganese(II) sulfate usually refers to the inorganic compound with the formula MnSO4·H2O of pale pink appearance. Manganese sulphate forms a variety of hydrates: monohydrate, tetrahydrate, pentahydrate and heptahydrate. The anhydrous substance is created by vaporization of most managnese compounds using Sulphuric Acid. Manganese sulfate is a by-product of various industrially significant oxidations that use manganese dioxide, including the manufacture of hydroquinone and anisaldehyde