The effects of daylight on chemistry

Discussion in 'Darkroom Developing and Printing' started by John, Oct 12, 2003.

  1. John

    John Guest

    Alrighty, just came across some fixer that was displaced during the move
    to our new home (see )
    It was stored in a 5 gallon tank with a floating lid. Unfortunately it's
    also been stored outside in daylight since June. The tank is about half full.
    Anyone care to explain the reactions that happen when a chemical such as
    thiosulfate is exposed to high levels of light for that length of time ?

    FWIW, I haven't tried it yet as I've been working a lot lately. Test
    strips tonight.

    John, Oct 12, 2003
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  2. John

    Gary Beasley Guest

    As far as I know thiosulfate will not be affected by the sunlight.
    Thiosulfate is used in pool maintenance to help regulate the chlorine
    levels so it it regularly used in brightly lighted conditions. Heat
    and/or ph problems most likely will be the culprits to cause sulfur to
    precipitate out. If you see no sulfur you are probably fine.
    Developers and silver salted solutions have always been recommended to
    be kept out of bright light, the first because organic compounds can
    be broken by energetic photons and silver salts go without saying they
    are sensitive.
    Gary Beasley, Oct 12, 2003
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  3. John

    David Foy Guest

    David Foy, Oct 14, 2003
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