Primarily used in the textile industry as a reducing agent in dyeing processes, particularly for vat dyes. It helps in the reduction of dyes to their soluble form, allowing them to penetrate fibers effectively. Additionally, it finds application in the stabilization of polymers and plastics, enhancing their durability and resistance to degradation. In water treatment, it aids in the removal of heavy metals by forming stable complexes, improving water quality. Its role in photographic development is also noteworthy, where it acts as a fixing agent to stabilize images on photographic films and papers.