[Jewelry making - Article 00014] - Re: [Orchid] Anodizing small niobium tube in silver brooch

[Marlin Cohrs]

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Felicity, I just have 4 quick comments.

    1). If Bill S gives you advice, if you follow it faithfully it's
    going to work - he has "been there and done that". 

    2). If the niobium tube was heated during fabrication, it can take on
    an oxide that will prevent anodizing to color. 

    3). When you "painted" with a wet paintbrush connected to the
    cathode, did the piece have a good electrical path to the anode? Did
    you see bubbles forming at the higher voltages? 

    4) I am not convinced that you could not immerse the entire piece and
    not damage the sterling finish, if there is any change you might be
    able to reverse the polarity and ionic clean or electrostrip any
    tarnish. 

    Let us know how you solve this problem. 

    Marlin, back from the Bench Conference Expo here in Denver and
    dreaming of too many new tools!
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