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Zone System: a photographic technique

Monday, January 21, 2002

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6:03:09 PM

subject: Fixer, Precipitate there in
author: robert/pat poor

I have a half used plastic bag of Sprint Speed Fixer and it has developed a white precipitate in it. It is generally stored at about 55 deg F and has most of the air removed as I use it. Is the precipitate fixer coming out of solution or a decomposition by product? and if the latter...what is the chemistry of the decomposition or reaction leading to the precipitate. Hypo should oxidize to a sulfate and thus be quite soluble. Anyway Mees?s book did not tell me much about the hypo itself.

Bob

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5:24:29 PM

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