What is the role of thiosulphates in fixing solution?

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Multiple Choice

What is the role of thiosulphates in fixing solution?

Explanation:
Fixing clears the film by dissolving unexposed silver halide crystals. Thiosulfate ions react with the unexposed silver halide (AgX) to form soluble silver-thiosulfate complexes (Ag(S2O3)2^3−). These soluble complexes are washed away, so any unexposed grains are removed and the developed image remains stable. This step does not harden the emulsion or develop the image; development creates metallic silver from exposed grains, and hardening is done by a separate hardener.

Fixing clears the film by dissolving unexposed silver halide crystals. Thiosulfate ions react with the unexposed silver halide (AgX) to form soluble silver-thiosulfate complexes (Ag(S2O3)2^3−). These soluble complexes are washed away, so any unexposed grains are removed and the developed image remains stable. This step does not harden the emulsion or develop the image; development creates metallic silver from exposed grains, and hardening is done by a separate hardener.

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