Potassium bisulfite (KHSO3) is a white, crystalline solid used as a preservative in food and beverages, a reducing agent in chemical synthesis, and in water treatment processes. It acts as an antioxidant and antimicrobial agent, preventing spoilage and discoloration. Potassium bisulfite is acidic and can cause skin and eye irritation upon contact. Proper handling requires the use of protective equipment such as gloves and goggles. Storage should be in a cool, dry place, away from incompatible substances like strong oxidizers. Disposal must follow local regulations to prevent environmental contamination. Potassium bisulfite is valued for its preservative and reducing properties, making it a useful additive in food, beverage, and industrial applications.

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