Fixer Testing?

Discussion in 'Color: Film, Paper, and Chemistry' started by HumbleP, Jan 21, 2013.

  1. HumbleP

    HumbleP Member

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    Could someone please explain fixer testing using a clip of film to a newbie?

    I'm about to try DIY C-41 so working with colour neg. Everything I read says time how long it takes to clear but what does "clear" mean with respect to colour neg? Am I looking for the emulsion to completely strip or for the neg to become opaque?

    Cheers,
    Peter
     
  2. Greg Davis

    Greg Davis Member

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    You should see the undeveloped film change from opaque to transparent. It will still have the orange mask color to it.
     
  3. Worker 11811

    Worker 11811 Member

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    Get a small piece of ordinary, undeveloped, unfixed film. You only need an inch or so. You can do this in ordinary room light.
    Use a dropper or a toothpick, etc., to put a drop of fixer on the film and let it work for a minute or so until you get a small, clear circle on the film.
    Drop the film into the fixer solution you want to test and stir it up so that the film is completely submerged.
    Use a stopwatch to time how long it takes until you can't tell where the drop was. Stop the timer. This is your clearing time.

    Fixing time is usually twice the clearing time.

    First, do this test with fresh, unused fixer the first time you use it. Remember (write down) the amount of time it took to clear the film.
    When your testing shows that it takes twice as long as it originally did, consider the fixer to be exhausted.

    Store your used fixer in a separate closed container, away from everything else, in a safe place where nobody (kids or pets) can get into it.
    When you have enough, dispose of it according to local regulations. I take mine to the Household Haz-Mat recycling day that's held in my town about two times a year.

    I don't know if the Silver Magnet works on C-41 fixer but I don't see why you couldn't use SOME method of recovering silver.
    If you can extract the silver, it would be worth doing.
     
  4. HumbleP

    HumbleP Member

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    Thanks for the replies. Apologies...I'm still a bit confused.
    The pics attached:
    First one - untested
    Second two - tested
    With respect to "clear" am I looking for the 2nd or 3rd result?
    Cheers
    IMG_0738.jpg
    IMG_0739.jpg
    IMG_0740.jpg
     
  5. Greg Davis

    Greg Davis Member

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    Second. What the hell did you do to get the third?
     
  6. Mike Wilde

    Mike Wilde Member

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    look at the files on the computer - maybe he fed it to some aphids to get the third picture results?

    Excessive fixing can bleach away the lighter tones of the image, but I have never seen evidence of the orange layer coming out of the film base.
     
  7. HumbleP

    HumbleP Member

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    Haha....yes, blame it on the Aphids!

    Thanks for the reply's. I'm ready now for first experiments. Will report back.
    Cheers