Figure 4From: Potassium ferrate [Fe(VI)] does not mediate self-sterilization of a surrogate mars soilCharacteristic colors of 10 mM water solutions of K2FeO4, KMnO4 and Fe2 (SO4)3. 1 = Permanganate; 2 = Potassium ferrate; 3 = Ferric chloride.Back to article page