Sodium Metabisulfite

Sodium metabisulfite = is a white, powdered inorganic compound used as a preservative, antioxidant, and disinfectant, common in food (E223), pharmaceuticals, and industrial processes, but it can trigger sulfite allergies, especially in asthmatics, by releasing sulfur dioxide in water. It's a reducing agent, used to prevent browning, bleach fibers, and in photography, though handling requires care due to its potential to cause respiratory issues or skin irritation in sensitive individuals.