Keeping times

Discussion in 'Alternative Processes' started by John Fontana, Dec 28, 2007.

  1. John Fontana

    John Fontana Member

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    Can anyone give me an idea of the shelf life of citric acid, and EDTA/Sulphite mixes, used for clearing of prints in the Ziatype process?
    Many thanks
    John
     
  2. Jim Noel

    Jim Noel Member

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    I don't worry about keeping times. It is so easy and cheap to mix these that I do so fresh each time I work. I never carry over either of these chemicals from one session to another. When using them for a class I sometimes mix up enough to last for a month, but we still do not re-use them.
     
  3. ann

    ann Subscriber

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    or you asking about dry chemicals?
     
  4. John Fontana

    John Fontana Member

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    I was meaning when mixed with water. I ask because although I agree citric acid and sodium sulphite are cheap, the EDTA Disodium I bought here in the UK was not.