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  • Webster's Revised Unabridged Dictionary
    • n Hydrosulphite (Chem) A saline compound of hydrosulphurous acid and a base.
    • ***
Century Dictionary and Cyclopedia
    • n hydrosulphite In chem., a salt of hydrosulphurous acid, now called hvposulphurous acid (H2S2O4).
    • ***


In literature:

Of such vats the copperas and lime and the hydrosulphite vats are examples.
"The Dyeing of Woollen Fabrics" by Franklin Beech
The hydrosulphite-indigo vat made by either of the two methods indicated above works well, and with due care may be kept in work for months.
"The Dyeing of Cotton Fabrics" by Franklin Beech
Next take 5 pints water, add hydrosulphite slowly, stirring gently until a reading of 1100 is shown (SG 1.1) on the hydrometer.
"Vegetable Dyes" by Ethel M. Mairet
The constituents of the hydrosulphite vat are hydrosulphite of soda, lime and indigo.
"Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 8" by Various
There is a bleaching preparation made in France known as "Redo," which is simply calcium hydrosulphite (CaS2O4).
"The Philippine Agricultural Review" by Various
Of the other reducing agents which have been used, sodium hydrosulphite (Na{2}SO{2}) deserves mention.
"Animal Proteins" by Hugh Garner Bennett