Used in the leather tanning industry to remove hair and impurities from animal hides during the liming process. Commonly applied in wastewater treatment to precipitate heavy metals as insoluble sulfides, aiding in pollution control. Employed in the pulp and paper industry for the production of sulfide pulping chemicals that help break down wood into fibers. Utilized in the synthesis of organic sulfur compounds and dyes. Also serves as a reducing agent in various industrial chemical processes and in the mining sector for the extraction of certain metals from ores.