Photographers' Formulary Sodium Thiosulfate (Hypo) Penta (Prismatic Rice) - 5 lbs
Expected availability: 2-4 weeks
- This item is noncancelable and nonreturnable.
Photographers' Formulary 10-1361 5LB 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 the 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.
Photographers' Formulary 10-1361 5LB Specs
Hyposulfite of soda
Sodium thiosulfate, pentahydrate
Thiosulfuric acid, disodium salt, pentahydrate
|Appearance||Large white monoclinic, colorless crystals and powder
|Uses||In preparation of fixing baths|
Ingredient in various reducers
|Chemical Formula||Na2S2O3.5H2O |
|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°F/32°C when mixing the crystalline form. Use 64% of the anhydrous salt as a substitute for crystalline hypo.
|Package Weight||5.28 lb|
|Box Dimensions (LxWxH)||7 x 7 x 6.5"|
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