Sodium thiosulfate is one of the few know substances that will dissolve silver bromide. As such it is universally used in modern photographic procedures.

In this process known as “fixation,” the unexposed silver bromide is dissolved in the sodium thiosulfate by combining with it to form soluble complex thiosulfates of silver and sodium.

UPC: 675152137036

Synonyms Antichlor
Hypo
Hyposulfite of soda
Sodium hyposulfite
Sodium subsulfite
Sodium thiosulfate, pentahydrate
Thiosulfuric acid, disodium salt, pentahydrate Appearance Large white monoclinic, colorless crystals and powder
Odorless Uses In preparation of fixing baths
Ingredient in various reducers Chemical Formula Na 2 S 2 O 3 .5H 2 O Notes Hypo is available in two forms: anhydrous and, more commonly crystalline. Crystalline hypo, when dissolved, lowers the temperature of the water considerably, whereas anhydrous does not.

Always begin with water of at least 90&degF/32&degC when mixing the crystalline form. Use 64% of the anhydrous salt as a substitute for crystalline hypo.

Packaging Info Package Weight 1.15 lb Box Dimensions (LxWxH) 4.9 x 3.0 x 3.0″

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