... AS CUSTOMER REQUIRED.USE: USED IN THE MANUFACTURE OF SULFUR DYES, LEATHER DEPILATING AGENT, METAL SMELTING, PHOTOGRAPHIC, ... RAYON DENITRATION ETC.. WIDELY USED IN LEATHER, PAPER, PROCESSING, ... PREPARING SODIUM HYDROSULFIDE, SODIUM SULFIDE, SODIUM THIOSULFATE, IN MILITARY INDUSTRY ALSO HAS A CERTAIN USE ITEMSSTANDARDRESULTSPURITY(Na2S ...