Ammonium thiosulfate has long been the preferred fixing agent in the photographic industry, valued for its exceptional speed, effectiveness, and compatibility with modern processing systems. As the successor to traditional sodium thiosulfate ("hypo"), ammonium thiosulfate fixers have revolutionized photographic processing by dramatically reducing fixing times while maintaining or improving image quality.

The Role of Fixer in Photographic Processing

In silver gelatin photographic processing, a fixing bath contains a chemical—either sodium thiosulfate or ammonium thiosulfate—used to remove light-sensitive silver halides from a photographic image and thus stabilize prints or film after it has been exposed to light.

Why Ammonium Thiosulfate Fixer?

Ammonium thiosulfate offers several significant advantages over traditional sodium thiosulfate fixers:

Superior Speed

• Dissolves silver halides 2-4 times faster than traditional sodium thiosulfate

• Acts three to four times faster than sodium thiosulfate

• Significantly reduces processing times in industrial labs

Rapid Fixing

• Fast-acting, non-hardening ammonium thiosulfate fixer assures complete fixing of papers in as little as 30 seconds

• Can be used to fix both paper and film

Versatility

• Suitable for all commonly used films, including black and white films, color negative films (C41), color reversal films (E6), and chromogenic films

• Ideal for fiber base and resin coated papers

• Recommended for archival processing

Applications in Photography

Professional Photography
Ammonium thiosulfate fixers are widely used in professional photography for:

• Black and white film processing

• Color negative film processing (C41)

• Color reversal film processing (E6)

• Print processing

Industrial and High-Throughput Imaging

• Functions as a rapid photographic fixer in high-throughput imaging applications

• Cuts operational costs in industrial laboratories

Archival Processing

• Useful for archival processing

• Recommended for Ilford emulsions

Specialized Formulations

Non-Hardening Fixers
Fast-acting, non-hardening ammonium thiosulfate fixers are available for applications where hardening is not required.

Combination Formulations
Some fixer formulations contain a mixture of ammonium thiosulfate and Ferrous EDTA, a powerful chelating agent.

Advantages Over Sodium Thiosulfate

Additional Benefits

Precious Metal Recovery
The fundamentally different and faster dissolution mechanism for silver halides with ammonium thiosulfate enables safer precious-metal recovery.

Environmental Considerations
ATS-based fixers can be processed for silver recovery, supporting environmental sustainability in photographic processing.

Market Trends

The photographic fixer segment continues to be a significant application for ammonium thiosulfate, with steady demand from professional photography, industrial imaging, and specialized applications.

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