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  1. #21

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    I would advise strongly against abrasion since that multiplies the surface area several times and provides lots of hard to reach sites for chemicals to trap and interfere with the next chemical step in a sequence.

  2. #22
    Greg Davis's Avatar
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    And that is why I want to find a chemical answer.
    www.gregorytdavis.com

    Did millions of people suddenly disappear? This may have an answer.

    "No one knows that day or hour, not even the angels in heaven, nor the Son, but only the Father." -Matthew 24:36

  3. #23

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    Quote Originally Posted by Greg Davis View Post
    The last thing I may try, if no chemical solution is found, is scrubbing with a mild abrasive,
    You don't want to do that. Much better to simply live with the very thin film of whatever it is, rather than scratch up and pit the surface providing numerous sites for chemical carryover and contamination. Since the film is resisting chemical efforts to clean it, it is very stable and thus not contaminative.

  4. #24
    Greg Davis's Avatar
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    FYI, CLR (Calcium, Lime, Rust) cleaner doesn't work at all.
    www.gregorytdavis.com

    Did millions of people suddenly disappear? This may have an answer.

    "No one knows that day or hour, not even the angels in heaven, nor the Son, but only the Father." -Matthew 24:36

  5. #25
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    Give us a list of what you tried. Then we might come up with something.

    PE

  6. #26
    Greg Davis's Avatar
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    So far I have tried:

    Plain dish detergent
    Polident
    Zep 505 Cleaner
    CLR (Calcium, Lime, Rust) cleaner
    www.gregorytdavis.com

    Did millions of people suddenly disappear? This may have an answer.

    "No one knows that day or hour, not even the angels in heaven, nor the Son, but only the Father." -Matthew 24:36

  7. #27
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    Then I suggest:

    Dichromate + H2SO4
    or
    NaOH (40%) + Na2SO3.....

    The first is for Silver and the second is for Sulfur.

    If the first works, then the previous owner was overtaxing his bleach/blix system and if the second works, his bleach/fix was very bad.

    PE

  8. #28
    George Nova Scotia's Avatar
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    Have you looked at this Kodak pub?

    http://wwwcaen.kodak.com:80/global/e...167/cis167.pdf

  9. #29

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    When I got my first studio job, every first friday of the month was tray cleaning day. Scouring 20x24 trays with Bon Ami was drudgery then I saw a commercial for Tarn Ex silver cleaner and gave it a try on my trays in my darkroom...Wow! instant clean and no scrubbing so I poured the cleaner back in the bottle and took it to work and on that first friday....Magic!!! I had saved the studio hours of work and did a better job and earned a $25 bonus. I still use it today. Try it and you'll be amazed. You can find it in most grocery stores or hardware stores.
    Denise Libby

  10. #30
    Wade D's Avatar
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    Potassium ferricyanide, part of Kodak Farmers Reducer, is a good cleaner though VERY toxic. Don't let it touch your skin. I've used it before on badly stained trays and reels and it does work. In this case I would defer to PE's decision though.

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