c-2 l of pure water then Swung for 100 g Potassium dichromate to 2500 ml glass beaker.-Use air stirring from stirring to dissolve completely,-Still small stirring, slowly to 200 ml of aqueous Phosphoric acid 85% on. -Stir the liquid for about 5 minutes before use.-The solution is heat in hot to supersonic 60oC
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