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Photographers' Formulary Sodium Thiosulfate (Hypo) Penta (Prismatic Rice) - 1 Lb.

BH #PHSTPLB • MFR #10-1360 1LB
Photographers' Formulary
Photographers' Formulary Sodium Thiosulfate (Hypo) Penta (Prismatic Rice) - 1 Lb.
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Photographers' Formulary 10-1360 1LB Overview

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: 675152136039

Photographers' Formulary 10-1360 1LB 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 Weight1.09 lb
Box Dimensions (LxWxH)5.1 x 3.1 x 3.05"

Photographers' Formulary 10-1360 1LB Reviews


By Eugene
Rated 5 out of 5
Date: 2018-08-09

fast shipping and reasonable prices.

works perfectly

By santanna
Rated 5 out of 5
Date: 2011-03-25

used the thiosulphate to fix my film after caffenol developing works better and was cheaper than regular fixer

Very Satisfied!!!!!

By Joye
Rated 5 out of 5
Date: 2014-11-19

I'm an illusionist and was needing to find a way of getting a larger quantity of this chemical. And the price could not be beat! The product I received was just what they said it would be. I will be placing all my orders in the future with B&H as well as refer my photographer friends to them!

dissolves easily

By Edmond
Rated 5 out of 5
Date: 2014-05-29

The Sodium Thiosulphate pentahydrate from Photographers formulary dissolves very cleanly and stores nicely. This is a great product if you need pure hypo.

works great

By David
Rated 5 out of 5
Date: 2014-03-04

Using this to fix caffenol developed negatives. Works fantastic as a 15% solution.

Sodium Thio maintains a solid fix

By ConcreteSnowman
Rated 4 out of 5
Date: 2012-05-08

Sensitivity of the fix is obviously dependent on the solvent. Works just as it should-- price is as cheap as Bostick & Sully..

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