Potassium Meta Bi Sulphite is a white crystalline powder that has a strong sulfur odor. It is alsois a food preservative, which preserves the natural color of food and protects food against bacteria. Winemakers also use Potassium Meta Bi Sulphite to preserve bottled wines. The chemical manufacturing industry uses Potassium Meta Bi Sulphite as a dye and printing agent, in gold processing and in photography for developing.