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  1. #21
    Photo Engineer's Avatar
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    Roger, it forms several types of polymers as well as a trimer. These do revert to formaldehyde on proper treatment.

    PE

  2. #22
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    I think formalin solution is usually stabilized with methanol, which increases its shelf life. At least mine is. Is it available without methanol stabilization? If it is, make sure you get the stabilized version, because the methanol doesn't cause any problems.

  3. #23
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    So I can use a 37% dilution of 10% formalin?
    Everybody has a photographic memory, some just don't have film.
    My Website and Gallery is at www.bcarlsonmedia.com
    My Twitter is @brendancarlson

  4. #24
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    Think about it Brendan. I'll give a quiz on this on Monday.

    PE

  5. #25
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    Fishy formalin

    I just got a pint of formalin from petsolutions.com (via Amazon) for not a lot of money. No detailed information as to what else (if anything) might be in the bottle, but it does say the active ingredient is "37% formaldehyde." It's a clear liquid and smells like formaldehyde. As a long-time aquarist I know that formalin has been used for many years to treat parasitic infestations. I'll see how good a stabilizer it makes. A pint should last me a while...

    Ulysses

  6. #26
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    formalin source

    Took me a while to find a source for formalin. Searching through ebay proved fruitless !!

    I'm not affiliated with this guy just found his prices reasonable.

    Talk to Tom at: lsalow@peakpeak.com

  7. #27
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    So, is the formalin based stabiliser suitable for ra4 print?

  8. #28
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    You don't need one for an RA4 print but EK does make a stabilizer for prints. And, the formalin stabilizer has no bad effect on an RA4 print except that you have to get the excess wiped off before it dries.

    PE

  9. #29

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    Quote Originally Posted by Photo Engineer View Post
    What does this mean? ALL C41 films made before about 2000 and all E6 films need formalin in sole form or another. Leave it out and your negatives and slides will turn green or red and may show a brown stain. If your process for these films does not contain formalin you will have problems in months, days or years. I cannot predict the failure rate. E6 processes without formalin or a pre-bleach bath will cause eventual problems whatever the date the films were made.
    Current color negative films (like Portra and Ektar) could benefit from a final rinse containing formalin? Or can I just omit it?


    Cheers,
    Flavio

  10. #30
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    A final rinse of some sort is recommended for ultimate stability. The type of stabilizer or final rinse depends on the type and age of the film.

    PE

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