In the dye industry, it is used to produce sulfur dyes, and it is the raw material of sulfur cyan and sulfur blue. In the printing and dyeing industry, it is used as a dye auxiliary for dissolving sulfur dyes. In the tanning industry, it is used for hydrolysis to dehair raw hides, and it is also used to formulate sodium polysulfide to accelerate the soaking of dry hides and help soften them. Paper industry Chemicalbook is used as a cooking agent for paper. The textile industry is used as a mordant for the denitration of man-made fibers and the reduction of nitrates, as well as the dyeing of cotton fabrics. The pharmaceutical industry is used to produce antipyretics such as phenacetin. In addition, it is also used to make sodium thiosulfate, sodium hydrosulfide, sodium polysulfide, etc.