5KFe[Fe(CN)6] + 9KCl + 8HCl + KMnO4 → 5K3[Fe(CN)6] + 5FeCl3 + MnCl2 + 4H2O
Iron(III)-potassium hexacyanoferrate(II) react with potassium chloride, hydrogen chloride and potassium permanganate to produce potassium hexacyanoferrate(III), iron(III) chloride, manganese(II) chloride and water. Hydrogen chloride - concentrated solution.