Photographers' Formulary Sodium Thiosulfate, Anhydrous - 10g

BH #PHSTA10G • MFR #10-1370 10G
Photographers' Formulary
Photographers' Formulary Sodium Thiosulfate, Anhydrous - 10g
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Photographers' Formulary 10-1370 10G Overview

Photographers' Formulary Sodium Thiosulfate is one of the few known 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: 675152137012

Photographers' Formulary 10-1370 10G Specs

Hyposulfite of soda
Sodium hyposulfite
Sodium subsulfite
Sodium thiosulfate, pentahydrate
Thiosulfuric acid, disodium salt, pentahydrate
AppearanceLarge white monoclinic, colorless crystals and powder
UsesIn preparation of fixing baths
Ingredient in various reducers
Chemical FormulaNa2S2O3.5H2O
NotesHypo 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°F/32°C when mixing the crystalline form. Use 64% of the anhydrous salt as a substitute for crystalline hypo.

Packaging Info
Package Weight0.04 lb
Box Dimensions (LxWxH)2.85 x 1.1 x 1.1"
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