[Jewelry making - Article 00201] - Re: [Orchid] Silver recovery

[Margaret Malm]

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    You need to find someone who has had experience working in a film
    processing operation.  There are several things that need to be
    decided in your case. First, are these "scrap" films some that have
    already been processed, and no longer needed, so you want to recover
    the silver? 

    Or are you talking about short ends, outdated unused film, or etc. 

    In the first case,  your best bet would be to consult one of the
    firms that does this as a business. The film would first need to be
    bleached, and then fixed, and the silver recovered from the fixer.
    However, if you expect to recover silver from color films, you are
    going to be greatly disappointed! Color films, once processed, do not
    have silver in them. And since most of the large-scale use of film
    nowadays is color film, such places are getting hard to find. 

    If it is film that has not been used or processed, then all you need
    is to run it through the fixer and then recover the silver from the
    fixer. 

    Recovering the silver from the fixer can be done electrolytically
    (generally used for large-scale silver recovery); or by something
    such as precipitating it with zinc dust (usually done in batch
    operations) and sending the sludge out to be refined. 

    Depending on how "small scale" you are thinking of, you might be
    able to get by with just running the fixer through one of the silver
    recovery cartridges that are available today. I think Kodak still
    makes them, and probably places like Handy and Harman and other
    places that do the necessary refining afterwards. I think there are
    some small-scale electrolytic units made to be used by "still"
    photographers and suchlike, also. 

Margaret


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