Photographers' Formulary 100g Anhydrous Sodium Thiosulfate

SKU: PYSTHA100G MFR: 10-1370 100G
$4.50
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Key Features

  • Achieve optimal image quality with our premium Anhydrous Sodium Thiosulfate.
  • Use as a fixer in film development for archival prints that last a lifetime.
  • Enjoy ease of use with our high-quality darkroom chemicals, perfect for beginners.
  • Maintain chemical consistency in your solutions with this reliable formula.
  • Control development time precisely for your black and white photography needs.
  • Enhance the tonal range in your prints with our trusted Sodium Thiosulfate.
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Special Order?Estimated to Ship: 09/08/2025

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Photographers' Formulary Sodium Thiosulfate 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

    100g (3.53oz)

About Photographers' Formulary Sodium Thiosulfate

How can you enhance your photographic development process With our 100g Anhydrous Sodium Thiosulfate, a key ingredient in the preparation of fixing baths and various reducers. This high-quality chemical compound, also known as 'hypo', is available in two forms: anhydrous and the more common crystalline.

The unique properties of our Anhydrous Sodium Thiosulfate set it apart from its crystalline counterpart. When dissolved, crystalline hypo significantly lowers the water temperature, requiring a starting temperature of at least 90 degrees Fahrenheit or 32 degrees Celsius. However, our anhydrous form does not have this effect, making it a more convenient and efficient choice for your photographic needs.

Moreover, when substituting anhydrous hypo for crystalline, you only need to use 64% of the anhydrous salt, making it a more economical option.

Whether you're a professional photographer or a hobbyist, our 100g Anhydrous Sodium Thiosulfate is an essential addition to your photographic toolkit, helping you achieve the perfect finish in your photo development process.

Photographers' Formulary Sodium Thiosulfate Features

  • High-quality 100g Anhydrous Sodium Thiosulfate for photographic development
  • Essential for preparing fixing baths and various reducers
  • Anhydrous form for convenient and efficient usage
  • Does not lower water temperature when dissolved unlike crystalline hypo
  • Economical choice, requiring only 64% of anhydrous salt as a substitute for crystalline
  • Ideal for both professional photographers and photography enthusiasts

Key Features

  • Achieve optimal image quality with our premium Anhydrous Sodium Thiosulfate.
  • Use as a fixer in film development for archival prints that last a lifetime.
  • Enjoy ease of use with our high-quality darkroom chemicals, perfect for beginners.
  • Maintain chemical consistency in your solutions with this reliable formula.
  • Control development time precisely for your black and white photography needs.
  • Enhance the tonal range in your prints with our trusted Sodium Thiosulfate.