Used in the leather tanning industry to remove hair and lime from animal hides during the liming process. Commonly applied in wastewater treatment to precipitate heavy metals as insoluble sulfides, aiding in purification. Employed in the production of sulfur dyes for textiles, particularly in manufacturing sulfur black dyes. Utilized in the pulp and paper industry to break down lignin in wood during chemical pulping. Also serves as a reducing agent in various chemical synthesis processes and in ore flotation processes within mining operations.