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  1. #1

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    Using formalin instead of paraformaldehyde

    Hello all...I wish to mix up the lith developer Dupont LD-1 (UnblinkingEye site). The formula calls for 7.5g of paraformaldehyde per litre of developer. How much formalin at 37% solution should I use as a replacement? I've tried to find the answer here and through Google with no luck.
    Thanks in advance, Lyn.
    Last edited by Lyn Arnold; 11-15-2007 at 11:24 PM. Click to view previous post history. Reason: amount of paraformaldehyde is 7.5g, not 75g

  2. #2

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    Here is a link that might contain the information you need, though it might require you to do some calculations.

    http://stainsfile.info/StainsFile/pr...erminology.htm

  3. #3

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    reply to chemistry question

    Quote Originally Posted by alanrockwood View Post
    Here is a link that might contain the information you need, though it might require you to do some calculations.

    http://stainsfile.info/StainsFile/pr...erminology.htm
    Thanks alanrockwood. Not many chemists out there???

    Lyn Arnold

  4. #4
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    Quote Originally Posted by Lyn Arnold View Post
    Thanks alanrockwood. Not many chemists out there???

    Lyn Arnold
    I'm working my vague memory here but I don;t think the two are interchangable, but I could be wrong about that.
    Don Bryant

  5. #5
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    Paraformaldeyhde turns into formaldehyde in water. I believe it needs a drop of base to help it along. I don't remember. I would have to look it up.

    PE



 

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