Response to Sodium thiosulafate vs. ammonium thiosulfate in alkaline fixer

In "The Film Developing Cookbook," Anchell and Troop say that sodium thiosulfate isn't able to reliably fix films or papers with a high iodide content, like vitually all of today's products. They say ammonium thiosulfate will do a much more thorough job (in addition to being twice as fast).

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