Permanganate is an intense dark purple color. Acidic solutions of permanganate are reduced to the faintly pink manganese(II) ion (Mn2+) and water. The solution of KMnO4 is drawn off from any precipitate of MnO2 concentrated and crystallized. The concentration of KMnO4 solution sitz bath is usually 1:10000. Solutions are faint pink to deep violet; permanganate solutions are most stable in the neutral or near-neutral pH region; acidic or alkaline solution decompose with. How to perform the test: Three drops of the compound to be tested are dissolved in 2 ml of water or aqueous ethanol.