[Jewelry making - Article 01457] - Re: [Orchid] Anodizing small niobium tube in silver brooch

[Noel]

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>     I need help to anodize a 4mm piece of niobium tube, which circles
>     a stg silver rod, in a stg silver brooch. 

    In my experience, the only way you will be able to do this is if you
    can isolate the niobium electrically from the silver. If you can
    coat the silver with tape, rubber cement, wax, or some other
    non-conducting material, or insert electric tape between the two
    metals so that they do not touch at all, you should be able to
    anodize normally. Otherwise, it seems as though the current just
    goes through the silver, turning it black, and not affecting the
    reactive metal at all. 

Good luck!
Noel
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