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Time in the fix is a variable. Best way to discover the correct time is to run a simple test. Save snippets of film, I retain the tongue (leader) of the 35mm cassette. Prepare the chemicals of the process and pour off a tiny sample of the fixer in sauce cup just big enough to allow you to half submerge the snippet. In normal room light, immerse the snippet and watch as the fixer goes to work. The film goes in opaque and after a time turns milky then transparent. The action you see it the fixer dissolving the silver salts.that are the light sensitive goodies. Time this action. The proper fix time, no matter what is twice the time it takes for the solution to clear the film. By the way, the chemistry of fixation is based on 45 to 70 seconds for photo papers and 2 to 7 minutes for black & white negative films.
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There are basically two types of widely used fixers based on sodium thiosulphate and ammonium thiosulphate. Fixing times are different for the two with sodium thiosulphate based fixers always taking longer. The sodium salt is usually supplied in crystals and the ammonium salt in the form of a concentrated solution. http://imaging.kodakalaris.com/sites/prod/files/files/resources/edbwf.pdf
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