I need help with C41 processing at home!!

Discussion in 'Color: Film, Paper, and Chemistry' started by tnabbott, Feb 12, 2011.

  1. tnabbott

    tnabbott Member

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    I have been processing C41 film at home using the Photographer's Formulary Kodak Flexicolor kit. Occasionally, my negatives show vertical pink bands on an edge of the film when scanned. In the example below the condition can be seen on the left vertical edge of the image and is most easily seen against the blue sky.

    Does anyone know what is causing this to occur? Thanks for your help!

    [​IMG]
    The Hospital by Thomas N. Abbott, on Flickr
     
  2. hpulley

    hpulley Member

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    What sort of tank and reel are you using? How much solution? What agitation time and method?
     
  3. tnabbott

    tnabbott Member

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    Paterson tank and reels (the tank holds 2 120 reels). I use 1L of solution per the guide on the base of the tank. I agitate according to the guidelines set out for small tank processing on page 2 of Kodak publication CIS-211 (i.e., 30 sec initial; 2-5 second subsequent every 15 seconds).
     
  4. markbarendt

    markbarendt Subscriber

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    Maybe 1-liter isn't quite enough?

    Try filling the tank from the faucet with empty reels and no cap until the reels are well covered. Pour that water into a graduated container and see how much you get.
     
  5. tnabbott

    tnabbott Member

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    Thanks. Even before seeing this problem, I've tried that out of curiosity to see whether the amounts stamped on the base were accurate; they are, as 1L of fluid entirely covers two 120 reels.
     
  6. hpulley

    hpulley Member

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    1L should be sufficient, I use that in my Paterson 3 (holds two 120) tank with a pair of 120 rolls.

    Is there a scratch on the negative there or is it just in the color? Could be a scratch in the red layer? I don't know.

    Did both rolls do this or just one?
     
  7. nyoung

    nyoung Member

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    if the streaks are visible outside the picture area and align with the areas between the sprocket holes its probably weak/contaminated fix or short fixing time or some combination. Try extending the fix time.
     
  8. tnabbott

    tnabbott Member

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    Thanks all for the responses!

    Harry: I cannot remember if it occurred on both rolls. I use the Paterson 3 as well and I am pretty sure I processed two 120 rolls when this occurred, but I noticed it with this one shot because of the blue sky.

    Nyoung: I will try extending the fix time. If I may ask, what are the risks of running the bleach or fix a little longer (e.g., instead of 6:30, 6:45)?

    Thanks!
     
  9. carlosmccosta

    carlosmccosta Member

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    No problem for extending the bleach and fix time.
    Are you sure the problem is with the negatives and not with the scanner?
    You can try to scan upside down and confirm.
    I remember to read about a problematic scanner doing like this.
    Regards.
     
  10. markbarendt

    markbarendt Subscriber

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    Developer time is critical because it doesn't normally go to completion, more time gets you more development and vice-versa.

    The rest of the steps do normally to go to completion in the specified time so extra time doesn't hurt.
     
  11. gmikol

    gmikol Member

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    At the risk of going off-topic...this may be a scanner artifact, especially if the edge in question is at at cut edge of a film strip. The OP can PM me and we can discuss it off-line.

    --Geg
     
  12. Athiril

    Athiril Subscriber

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    Reels can also slip upwards on the centre column too when doing inversions.
     
  13. hpulley

    hpulley Member

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    They can but two 120 reels fit perfectly in the Paterson 3 tank so unless the funnel wasn't on right I think this is unlikely.

    In the Universal tank (holds 2 135 or one 120) it is easy for this to happen however, unless you have a spacer the 120 reel can ride up a fair bit so it is safer to use the Paterson 3 with an empty reel instead if you don't have the spacer.
     
  14. fschifano

    fschifano Member

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    A rubber band wrapped tightly around the core above the top reel will prevent any slippage and does not interfere with the chemistry at all. So if you need a dry reel for another go around, there is no need to use empty reels as spacers.
     
  15. tnabbott

    tnabbott Member

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    Thanks All! I can rule out movement of the reels (I've had this problem before :-/ ) and the amount of fluid. It seems the a cause related to the scanner might be most likely, but I must admit that is not a satisfying answer to me because the problem does not always occur. I suppose I can send out the negative in question to Chrome for scanning to see whether the issue replicates (then it's my handling of chemicals) or not (then it's the scanner). What do you guys think?
     
  16. 2F/2F

    2F/2F Member

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  17. rphenning

    rphenning Member

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    dude. its your scanner.
     
  18. Ed Sukach

    Ed Sukach Member

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    Nowhere near as "critical" as some would believe. I've mistakenly neglected to stop the developer by as much as a minute and a half, with the greatest effect being a mild shift in overall color - not beyond usual variations.

    The more I think of this, the more suspicious I become of the scanner. Try a different negative orientation and look for a change in the banding location.
     
  19. markbarendt

    markbarendt Subscriber

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    I agree, completely.

    This may be a topic for a thread on DPUG.
     
  20. hpulley

    hpulley Member

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    Rubber band to hold the reel on the tank? Thanks, I'll try that.

    Can you put the negative in an enlarger or use a magnifier to check for the line?
     
  21. Mark Antony

    Mark Antony Member

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    Looks like a scanner artefact. I get them when the little glass part at the top of the holder on my V500 is dusty.
    Flip the neg upside down (so the band should appear on the opposite side) if its still on the LHS its the scanner.
    Mark Antony
     
  22. hpulley

    hpulley Member

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    Clean and calibrate your scanner I guess.
     
  23. tnabbott

    tnabbott Member

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    Thanks, that seems to be a consensus that has developed based on the characteristics of the image I posted. Any idea if there are setting I can change to avoid this result? I should never have sold my Nikon 9000!
     
  24. tnabbott

    tnabbott Member

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    Yes, that's the one. I'm not too suspicious of the kit because I've developed other rolls with it that do not exhibit the pink stripe. FWIW, it's not a bad kit, but I find that getting the SM chemistry from Liberty is a better deal per roll.