Industrial Grade Potassium Metabisulfite is a white crystalline powder with a faint odour of sulphur dioxide gas. The Metabisulfite is used in photography industry and in food preservative industry. The Metabisulfite comes in 25 Kg/ 50 Kg packing in HDPE bag with extra liner inside. The Industrial Grade Potassium Metabisulfite is clear and colourless.