Potassium sulfite is a chemical compound with the formula K2SO3. It appears as a white, crystalline solid and is soluble in water. This compound is commonly used as a preservative in food and beverages, particularly in the wine industry, to prevent oxidation and spoilage. In addition to its use in food preservation, potassium sulfite has applications in photography and water treatment. It acts as a reducing agent and is also utilized in the production of various chemicals. Safety precautions are necessary when handling this compound, as it can cause irritation to the skin and eyes.