Sodium metabisulfite appears as a white crystalline or powder solid with a slight sulfur odor. The substance is sometimes referred to as disodium metabisulfite. It is used as a disinfectant, antioxidant, and preservative agent. Sodium metabisulphite is used as an antioxidant agent in many pharmaceutical formulations. It is extensively used as a food preservative and disinfectant. It has been demonstrated that sulphite exposure can affect some organs. APPLICATION Food preservation and additive Sanitization and cleaning agent Photography Fungicide Preservatives and Antioxidants MEDICATION Bleaching agents Fillers Functional fluids (open systems) Laboratory chemicals Solvents (for cleaning and degreasing) Water treatment