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It is used as the source of SO2 in wine, an important anti-oxidant and bactericide
It is also used to precipitate gold from auric acid .
It is used in waste treatment to chemically reduce hexavalent chromium to trivalent chromium which can then be precipitated and removed from an aqueous waste stream.
It is used as a bleaching agent in the production of coconut cream
It is used as a reducing agent to break sulfide bonds in shrunken items of clothing made of natural fibers. This allows the garment to go back to its original shape after washing
It is used as an SO2 source (mixed with air or oxygen) for the destruction of cyanide in commercial gold cyanidation processes.
In the oil and gas industry it is used as a corrosion inhibitor/oxygen scavenger.
It is used in the water treatment industry to quench chlorine residual
It is used in tint etching iron-based metal samples for microstructural analysis.
