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  • Webster's Revised Unabridged Dictionary
    • n Hyposulphite (Chem) A salt of what was formerly called hyposulphurous acid; a thiosulphate.
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Century Dictionary and Cyclopedia
    • n hyposulphite A salt of hyposulphurous acid (H2SO2). Sodium hyposulphite, (hyposulphite of soda) is the commercial name for sodium thiosulphite, a salt of thiosulphurous acid (H2S2O3), which is used by dyers for reducing indigo, and generally in the arts as a reducing or deoxidizing agent—notably in photography, as the usual chemical for fixing plates and prints.
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In literature:

The hyposulphite solution should be often filtered through a sponge, and it will answer for a great number of washings.
"American Handbook of the Daguerrotype" by Samuel D. Humphrey
Porcelain pans or dishes, for applying the hyposulphite of soda and washing after the imagine is fixed, something in form like fig.
"The History and Practice of the Art of Photography" by Henry H. Snelling
Potassium chlorate, 7.8 parts; lead hyposulphite, 2.6 parts; gum arabic, 1 part.
"Burroughs' Encyclopaedia of Astounding Facts and Useful Information, 1889" by Barkham Burroughs
The hyposulphites, and several other sulphides, also give off sulphur when heated.
"A System of Instruction in the Practical Use of the Blowpipe" by Anonymous
Silverware is cleansed by rubbing with a solution of sodium hyposulphite.
"Handbook on Japanning: 2nd Edition" by William N. Brown
Four drams of hyposulphite of soda in feed twice a day has produced good results.
"Pratt's Practical Pointers on the Care of Livestock and Poultry" by Pratt Food Co.
To the drinking water add one ounce of Hyposulphite of Soda twice a day.
"The Veterinarian" by Chas. J. Korinek
Hyposulphite of soda 1 oz.
"Notes and Queries, Number 189, June 11, 1853" by Various
To substitute hot water instead of breathing does not destroy the hyposulphite, and therefore will not do.
"Notes and Queries, Number 180, April 9, 1853" by Various
The bath should be freshly made up, 3 ounces of hyposulphite of soda to 16 ounces of water.
"Bromide Printing and Enlarging" by John A. Tennant
Then he plunged it in the hyposulphite, and pulled up the blind.
"" by E.W. Hornung
Afterwards half an ounce of hyposulphite of soda mixed with the feed may be given twice a day for a week.
"Special Report on Diseases of Cattle" by U.S. Department of Agriculture
The hyposulphite, lastly, should be effectually removed from the negative by soaking in water, which should be frequently changed.
"Notes and Queries, Number 216, December 17, 1853" by Various
When an entire nest is taken it should be disinfected with hyposulphite of soda or insect-powder.
"Encyclopaedia Britannica, 11th Edition, Volume 3, Slice 7" by Various
It is as hard to get rid of from the copper as hyposulphite is from a negative.
"Photogravure" by Henry R. Blaney
Hyposulphite of soda discovered by M. Chaussier.
"The Evolution of Photography" by John Werge
This is fixed without toning in a solution of hyposulphite of soda.
"Photographic Amusements, Ninth Edition" by Walter E. Woodbury and Frank R. Fraprie
Sodium hyposulphite (hypo) 47 C. 13.
"Physics" by Willis Eugene Tower
The image is then fixed by dissolving out the chloride of silver unaltered by light in a bath of hyposulphite of soda.
"The Progress of Invention in the Nineteenth Century." by Edward W. Byrn