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dithionite (aka sodium hydrosulfite or sodium hydrosulphite) is
a white crystalline powder with a weak sulfurous odor. It is
stable under most conditions, although it will decompose in hot
water and in acid solutions. It can be obtained by the following
reaction: This compound is a water-soluble salt, and can be used
as a reducing agent in aqueous solutions. It is used as such in
some industrial dying processes, where an otherwise water-
insoluble dye can be reduced into a water-soluble alkali metal
salt. The reduction properties of sodium dithionite also
eliminate excess dye, residual oxide, and unintended pigments,
thereby improving overall colour quality. It can also be used as
a bleach, in, for instance, paper p