Centuries ago, ancient people discovered that sulfur gas could keep food from spoiling and whiten fabrics.But messy, unstable sulfur smoke was far from perfect.Then comes sodium metabisulfite, the all-round chemical "hero".
Sodium Metabisulfite (SMBS) has a long history: Ancient Greeks and Romans used sulfur-burning SO₂ for food preservation and fabric bleaching. In the mid-19th century, it was chemically synthesized as a stable solid, replacing gaseous SO₂. By the 20th century, it was industrialized globally for food, papermaking, textiles, water treatment and mining.
China developed from small-scale production in the 1950s to the world's largest producer, accounting for 42% of global capacity, with food-grade sodium metabisulfite and industrial-grade SMBS as mainstream exports.
