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Thread: Problem with Pyrocat-MC

  1. #1

    Join Date
    Oct 2011
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    Problem with Pyrocat-MC

    I've been working in the darkroom for a good 40 years but am totally puzzled by my results with Pyrocat-MC.

    I'm using TMAX 400 4x5, and it's all coming out under-developed (using the edge marking as a guide). I've mixed the developer in my tap water (filtered well water) as well as bottled drinking and distilled water, with no change in result. Time/temp is 10 mins in tray at 75F, shuffing usually two sheets, continuously for the first 30 secs, then at 30 sec intervals. I'm using TF4 fixer w/o stop bath. Everything looks a stop or two under.

    I just shot and processed a test with a different meter, scrupulously checking exposure, bellows extension factors, etc etc, and it's just like all the others.

    When I mix up my dev (6cc + 6cc + 600ml H20) it's slightly brown in the tray, and after I've finished developing (after 10 mins) it's turned wine red/purple, which I gather is normal. The code on the bottles is 120.

    What am I doing wrong?????

    Thanks

  2. #2

    Join Date
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    Re: Problem with Pyrocat-MC

    I think you might be under-developing. Depending on the range of the scene I process TMY-2 which I rate at 250 EI for 18 minutes @72, agitating every 3 minutes. I enlarge with a color head.

  3. #3

    Join Date
    Apr 2009
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    Re: Problem with Pyrocat-MC

    I have to add a bit to the published times for Pyrocat-MC as well. Don't take the "standard" development times at face value.

  4. #4

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    Re: Problem with Pyrocat-MC

    Jon,

    Edge markings are not a very reliable indicator of proper development. Have scanned/printed your negs?

  5. #5
    ic-racer's Avatar
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    Feb 2007
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    Re: Problem with Pyrocat-MC

    I just shot and processed a test with a different meter, scrupulously checking exposure, bellows extension factors, etc etc, and it's just like all the others
    Was that a Zone 1 test shot? Did it come out to 0.1 log D?

    Increase development by 20% and re-assess. Keep increasing development time until they are printable on your favorite paper. If you use multigrade paper, there is a lot of leeway.

  6. #6

    Join Date
    Oct 2011
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    Re: Problem with Pyrocat-MC

    I checked in with Sherry at Photographer's Formulary and learned that the batch number on the bottles dates from two years ago - she thinks that's the problem. How time flies ...

    I'll get some fresh juice and reassess.

    Many thanks for the input.

  7. #7
    Cor's Avatar
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    Nov 2006
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    Leiden, The Netherlands
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    Re: Problem with Pyrocat-MC

    Jon,

    If it's mixed in glycol, it should be ok. Stock colour changed to a very deep brown/black, but with no adverse effects (checked with the Guru himself..;-)..) It seems that the metol is causing the colour change a deep brown with no adverse effects on development.

    Best,

    Cor

  8. #8
    Bob Farr's Avatar
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    Dec 2007
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    Pacific Northwest
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    Re: Problem with Pyrocat-MC

    In addition to the above, are you pre-soaking the film?? And do you have enough developer so it does not become exhausted during development??

    Good luck, let us know what you find out.
    Bob

  9. #9

    Join Date
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    New Berlin, Wi
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    Re: Problem with Pyrocat-MC

    My normal time for TMY in MC is 14 minutes with continuous agitation...EC
    Last edited by evan clarke; 6-Oct-2011 at 17:31.

  10. #10

    Join Date
    Sep 2003
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    New Berlin, Wi
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    Re: Problem with Pyrocat-MC

    Also, at 1+1+100 ANY fixer residue will kill development.. I am using 1.5+1.5+100..

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