Photographers' Formulary 10lbs Anhydrous Sodium Thiosulfate

SKU: PYSTHA10LB MFR: 10-1372 10LB
$59.95
Earn VIP Reward Points

Key Features

  • Achieve archival quality prints with our premium Sodium Thiosulfate fixer.
  • Enjoy consistent results in your darkroom with this high-purity chemical.
  • This easy to use formula ensures fine grain negatives for stunning details.
  • Perfect for creating long-lasting black and white photographs you'll cherish.
  • Use in fixing baths to remove unexposed silver halides effectively.
  • Our long shelf-life Sodium Thiosulfate guarantees reliable performance.
See More Product Details
Special Order?Estimated to Ship: 08/17/2025

Protect your gear with Adorama Protect.* Learn more

1 Year

$4.99

2 Year

$7.99

3 Year

$13.99

Available to U.S. customers only.

Need help? Ask our experts.

Overview
Compare
Specs
Protection
Q&A

Questions & Answers

Reviews about this item

Review Summary

Select a plan in the Add Protection section above and purchase with this product by clicking “Add to Cart”.

image-protection

TRUSTED PROTECTION PLANS, EXCEPTIONAL SERVICE.

Invest In Your Gear and Peace Of Mind!

Accidents happen. Protect your favorite Adorama products and purchase a protection plan to stay covered from accidental damage, mechanical or electrical failures, and more.

Repair or Replacement

Repair or Replacement

If we can’t fix it, we’ll replace it at no additional cost.

Accidental Damage

Accidental Damage

Protect your product from drops, spills, and more.

Peace of Mind

Peace of Mind

Enjoy your gear without fear. We have you covered!

Failure Protection

Failure Protection

When regular use of your product over time results in mechanical or electrical failure.

Zero Deductible

Zero Deductible

We will never charge you a deductible after the purchase of a plan.

Customer-Focused Support

Customer-Focused Support

Our claims process is simple & easy and our customer service team is happy to help.

Adorama Protect powered by Extend is available for purchase to customers in the United States. Not available for international or U.S. territories purchases. Plans on open box items do not cover pre-existing damage.
Adorama Protect plans are available for ABS clients. If you have any questions or require assistanse, please call 800-223-2500

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

    10lbs (4.54kg)

About Photographers' Formulary Sodium Thiosulfate

After meticulous research and development, Photographers' Formulary presents its 10lbs Anhydrous Sodium Thiosulfate, a pure, professional-grade chemical essential for the modern darkroom enthusiast. This high-quality, reliable product is designed for photographers who demand the utmost in image development and archival permanence.

Crafted with effectiveness in mind, this anhydrous sodium thiosulfate serves as a key component in the preparation of fixing baths, ensuring that your photographs are processed with the highest level of care. Its anhydrous form is preferred by many professionals for its stable and consistent performance, as it does not lower the temperature of the water when dissolved, unlike its crystalline counterpart. This characteristic makes it a convenient choice for those seeking to maintain optimal developing conditions without the need for temperature adjustments.

Additionally, this versatile chemical acts as an ingredient in various photographic reducers, offering you the flexibility to fine-tune your developing process to achieve the desired results. Whether you're working in a professional studio setting or a dedicated home darkroom, the Photographers' Formulary's Anhydrous Sodium Thiosulfate is an effective solution that supports a wide range of photographic applications.

For those who prefer anhydrous sodium thiosulfate over crystalline hypo, it is important to note that you can use 64% of the anhydrous salt as a direct substitute, ensuring a seamless transition in your developing routine. This bulk 10-pound offering not only provides quality but also convenience, allowing you to stock up and streamline your workflow without frequent reordering.

Elevate your photographic development process with the purity and reliability of Photographers' Formulary's Anhydrous Sodium Thiosulfate, and experience the difference that professional-grade chemicals can make in the preservation and presentation of your work.

Photographers' Formulary Sodium Thiosulfate Features

  • Professional-grade Anhydrous Sodium Thiosulfate for photographic development
  • Pure and stable chemical composition ensures consistent results
  • Ideal for fixing baths and photographic reducers in darkroom processing
  • Convenient bulk 10lb quantity for extensive use and efficiency
  • Maintains optimal developing conditions without temperature adjustments
  • Compatible as a 64% substitute for crystalline hypo in developing routines

Key Features

  • Achieve archival quality prints with our premium Sodium Thiosulfate fixer.
  • Enjoy consistent results in your darkroom with this high-purity chemical.
  • This easy to use formula ensures fine grain negatives for stunning details.
  • Perfect for creating long-lasting black and white photographs you'll cherish.
  • Use in fixing baths to remove unexposed silver halides effectively.
  • Our long shelf-life Sodium Thiosulfate guarantees reliable performance.