Sodium Sulfite

Sodium sulfite is a white, water-soluble inorganic salt used as a food preservative (E221) and antioxidant, preventing discoloration and spoilage in foods like dried fruits, juices, and seafood, and is also vital in water treatment, paper manufacturing, and photography as a reducing agent to scavenge oxygen and control pH. While Generally Recognized As Safe (GRAS) for many uses, it can trigger severe allergic reactions, especially asthma, in sensitive individuals, necessitating careful labeling and handling.