Potassium Meta Bi Sulphite CHARACTERISTIC Physical appearance Assay as K2S205 Clarity of 10% solution PH of 5% solution Iron content Heavy metal(as Pb) Arsenic Selenium Water Insoluble % max White Crystalline Powder 95 %mix SPECIFICATION clear and colourless 4 – 5.5 10 ppm max 10ppm max 3 ppm max 3 ppm max 0.05% APPLICATION specialty chemicals , food Preservatives, Pharmaceutical industry, Laboratory chemicals, photography