Our Photography Grade Sodium Metabisulfite (also known as Sodium Pyrosulfite) is a trusted darkroom chemical designed for photographers and film enthusiasts alike. This high-purity compound is essential for black-and-white film processing, serving as a reducing agent and preservative to maintain the quality of photographic chemicals. Sodium Metabisulfite can also be used for toning, fixing, and custom photo development, giving photographers control over their images and ensuring longevity.