Using formalin instead of paraformaldehyde

Discussion in 'B&W: Film, Paper, Chemistry' started by Lyn Arnold, Nov 16, 2007.

  1. Lyn Arnold

    Lyn Arnold Subscriber

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    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 a moderator: Nov 16, 2007
  2. alanrockwood

    alanrockwood Member

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  3. Lyn Arnold

    Lyn Arnold Subscriber

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  4. donbga

    donbga Member

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    I'm working my vague memory here but I don;t think the two are interchangable, but I could be wrong about that.
     
  5. Photo Engineer

    Photo Engineer Subscriber

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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