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  1. #1

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    Sharing Graduates & Cross Contamination

    So I'm currently setup for basic at home b&w processing, but I'm going to try my hand at the C-41 process soon and I have a question about using my b&w graduates that hold and mix my developer and fixer. I would like to just mix the color developer in my b&w developer graduate and my blix solution in the b&w fix graduate. I'm worried that these could cross contaminate the graduates when I go back to use them for a different process, i.e. getting color contamination in b&w and vice versa. Is this a legitimate issue to worry about, or will a nice thorough washing help avoid these issues? I would appreciate any insight into this, thanks!

  2. #2
    AlexG's Avatar
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    Are your graduates made from glass of plastic?

    Sometimes my plastic graduates tend to leave a bit of residue even after a thorough washing. The Pyrex graduates always seem to never leave any residue.


    I've mixed C-41 chems before in both my plastic and glass beakers but never seem to have any problems though.

    Edit: Just remember to use different bottles to store your chemicals!

  3. #3

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    Sounds good, I figured that there would be some degradation over time with the plastic graduates, but glad to see I should be good to go in the short run!

  4. #4
    Photo Engineer's Avatar
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    Use developer graduates for developer and blix and fix graduates for blix and fix. Use stronger bleach graduates for blix and fix as well, but give a good extra wash. Use separate graduates for stabilzer and photo flo solutions which are quite similar.

    Do not use plastic for developers of any sort. This is due to all of the organic matter.

    PE

  5. #5

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    Quote Originally Posted by Photo Engineer View Post
    Use developer graduates for developer and blix and fix graduates for blix and fix. Use stronger bleach graduates for blix and fix as well, but give a good extra wash. Use separate graduates for stabilzer and photo flo solutions which are quite similar.

    Do not use plastic for developers of any sort. This is due to all of the organic matter.

    PE
    PE,

    Are you suggesting that all developer mixing should be undertaken in in glass beakers?

    Tom.

  6. #6
    David Brown's Avatar
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    Quote Originally Posted by Photo Engineer View Post
    Do not use plastic for developers of any sort. This is due to all of the organic matter.

    PE
    Don't they all come in plastic bottles?

  7. #7

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    So plastic or not?

  8. #8
    Christopher Walrath's Avatar
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    Wirelessly posted (BlackBerry9000/4.6.0.167 Profile/MIDP-2.0 Configuration/CLDC-1.1 VendorID/102 UP.Link/6.3.0.0.0)

    Mixing in plastic would be fine. As a rule I mix one shot/ one session chems so I store my opened stock in amber glass bottles just as a precaution.
    Thank you.
    CWalrath
    APUG BLIND PRINT EXCHANGE
    DE Darkroom

    "Wubba, wubba, wubba. Bing, bang, bong. Yuck, yuck, yuck and a fiddle-dee-dee." - The Yeti

  9. #9
    Mick Fagan's Avatar
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    PE is correct from a pure technical point, however in a home darkroom we often make concessions due mainly to space, cost and being practical.

    I myself use Jobo graduates, they are plastic and virtually impermeable to contamination from photographic chemicals. If they weren't, then I would have been in trouble many years ago.

    I do though follow PE's advice regarding using a set of graduates for developers, another for bleach and fix solutions, plus another set for stabiliser and Photo-Flow solutions.

    I have mixed up E6, C41, B&W and a myriad of other kinds of solutions using about 12 different graduates. I did start to use glass about 15 years ago, but due to a lack of feeling in my hands and fingers, I started to drop things and started to break them, so I reverted back to my plastic graduates.

    I also use my Durst Printo paper processor for Colour negative paper prints, as well as B&W negative paper prints. I have switched back and forth over the last 18 or so years I have had the machine with no discernible problems. That doesn't mean that one could not measure a cross contamination, it is just that I haven't noticed any and none of my prints that have been processed have shown any problems, although from a scientific point of view, this practice would be unacceptable.

    From a home processing point of view, I would suggest you do whatever you can afford. If at a later stage you really swing into colour processing, then outlay some dosh and get another set of graduates and go from there.

    One point of view in this debate about single use graduates, are the film developing tanks available today. The great majority are plastic, very, very few are stainless steel. Virtually everyone switches from B&W to C41 to E6 to whatever in the same tank!

    Mick.

  10. #10
    Photo Engineer's Avatar
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    Quote Originally Posted by David Brown View Post
    Don't they all come in plastic bottles?
    You don't continuously reuse the plastic source bottles. They are usually discarded or reused for the same chemistry.

    PE

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