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

B&H # PHSTPLB Mfr # 10-1360 1LB
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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.

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 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.

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by PowerReviews
Photographers' FormularySodium Thiosulfate (Hypo) Penta (Prismatic Rice) - 1 Lb.
 
4.7

(based on 3 reviews)

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Reviewed by 3 customers

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5.0

works great

By David

from NC USA

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

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

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4.0

Sodium Thio maintains a solid fix

By ConcreteSnowman

from Grand Rapids, MI

About Me Photography Student

Verified Buyer

Pros

  • Cheap
  • Clean
  • Consistent Reactions

Cons

  • Can accumulate moisture
  • Heavy

Best Uses

  • Printing

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

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

  • Was this a gift?:
  • No

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5.0

works perfectly

By lizard

from fulton, ms

About Me Casual Photographer

Verified Buyer

Pros

  • Consistent Reactions

Cons

    Best Uses

    • Developing

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

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

    • Was this a gift?:
    • No

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