Photographers' Formulary 20lbs Sodium Thiosulfate (Hypo), Penta (Prismatic Rice)

SKU: PYSTHP20LB MFR: 10-1363 20LB
$89.95
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Key Features

  • Achieve archival quality prints with our premium Sodium Thiosulfate fixer.
  • Enjoy consistent results in your darkroom with this reliable hypo solution.
  • Our easy mixing formula ensures hassle-free preparation of your fixing baths.
  • Use as an essential ingredient in various reducers for precise image control.
  • Experience fine grain negatives using this high-quality darkroom chemical.
  • This 20lb supply of Sodium Thiosulfate offers long shelf-life and great value.
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Special Order?Estimated to Ship: 09/06/2025

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Photographers' Formulary Sodium Thiosulfate (Hypo) Specifications

  • 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

  • Weight

    20lbs (9.07kg)

About Photographers' Formulary Sodium Thiosulfate (Hypo)

Experience the versatility and efficiency of our 20lbs Sodium Thiosulfate (Hypo), Penta (Prismatic Rice). This high-quality chemical compound is a key ingredient in a variety of applications, making it an essential addition to your supplies.

Sodium Thiosulfate is widely used in the preparation of fixing baths, a crucial step in the photographic development process. It acts as a reducing agent, helping to remove unexposed silver halides from the film or paper, thus stabilizing the image.

This product is also a vital ingredient in various reducers, contributing to the chemical reactions that alter the oxidation state of atoms within the molecules.

It's important to note that Sodium Thiosulfate (Hypo) is available in two forms: anhydrous and crystalline. The crystalline form, when dissolved, significantly lowers the water temperature. On the other hand, the anhydrous form does not have this effect. Therefore, when mixing the crystalline form, it's recommended to start with water of at least 90 degrees Fahrenheit (32 degrees Celsius).

If you're using the anhydrous form as a substitute for crystalline hypo, use 64% of the anhydrous salt. This ensures the correct chemical balance and optimal performance in your applications.

With our 20lbs Sodium Thiosulfate (Hypo), Penta (Prismatic Rice), you're investing in a product that delivers reliability, consistency, and superior results in your photographic and chemical processes.

Photographers' Formulary Sodium Thiosulfate (Hypo) Features

  • High-quality 20lbs Sodium Thiosulfate (Hypo), Penta (Prismatic Rice) for versatile applications
  • Essential for preparing photographic fixing baths and various reducers
  • Available in two forms: anhydrous and crystalline for different usage scenarios
  • Crystalline form lowers water temperature when dissolved, ideal for specific chemical reactions
  • Anhydrous form can be used as a substitute for crystalline hypo at 64% ratio
  • Ensures reliable, consistent, and superior results in photographic and chemical processes

Key Features

  • Achieve archival quality prints with our premium Sodium Thiosulfate fixer.
  • Enjoy consistent results in your darkroom with this reliable hypo solution.
  • Our easy mixing formula ensures hassle-free preparation of your fixing baths.
  • Use as an essential ingredient in various reducers for precise image control.
  • Experience fine grain negatives using this high-quality darkroom chemical.
  • This 20lb supply of Sodium Thiosulfate offers long shelf-life and great value.