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Thread: Old PMK Pyro film developer

  1. #1

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    Old PMK Pyro film developer

    So - for various reasons, I have not been able to do any film processing for a couple of years. I have some PMK pyro developer (parts A and B) sitting up on a shelf that has not been touched during that time. The bottles are about 2 years old and are about 3/4 full. The solution B has turned dark brown over this time. Do you guys think both bottles are still good to mix and use or should just I throw them out and get some new stuff?

  2. #2

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    Re: Old PMK Pyro film developer

    I would say "B" is likely oxidized, but give it a try on a snip of film.

  3. #3
    Drew Wiley
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    Re: Old PMK Pyro film developer

    It's remarkably stable even when oxidized and dark brown, and the bottle mostly empty, as long as the two components are unmixed. But it's the clear B solution more likely to cause an issue if there's granular settling in the bottle. If so, mix of shake the B part well before mixture with Part A. This is generally a cold weather issue. But of course, if you are dealing with valuable negatives, it's better to be safe than sorry.

  4. #4

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    Re: Old PMK Pyro film developer

    Quote Originally Posted by Drew Wiley View Post
    It's remarkably stable even when oxidized and dark brown, and the bottle mostly empty, as long as the two components are unmixed. But it's the clear B solution more likely to cause an issue if there's granular settling in the bottle. If so, mix of shake the B part well before mixture with Part A. This is generally a cold weather issue. But of course, if you are dealing with valuable negatives, it's better to be safe than sorry.


    There is a small amount of granules on the bottom of Bottle B, but I've had that before with "good" developer. I normally shoot 8 x 10, but maybel I'll try it out on a sheet of 4 x 5 to see if it works.

  5. #5
    Drew Wiley
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    Re: Old PMK Pyro film developer

    Try putting the B bottle in a warm water bath awhile first, and see if the sediment dissolves more easily. A tiny bit unmixed won't have much appreciable effect, but the degree of final contrast can be slightly affected if too much remains settled out of solution.

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