1) Semi conductors: Used for etching silico wafers use in circuits
and
other chips
2) Metal surface treatment: Pickling of metals ( steel sheet prior
to
nickel plating, zinc prior to copper plating ) )
3) Preservative: Manufacture of wood preservatives
4) Glass Processing: Used as glazing i.e
etching and engraving glass
5) Preservatives: Brewery to control fermentation
6) Textile: Removal of iron stains
