[Jewelry making - Article 00150] - [Orchid] Nitric acid to remove broken drillbit?

[angela ajootian]

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    Hello all. I've got a drillbit about 1mm diameter bit broken off in
    about .5in thick sheet of art bronze. I seem to recall some
    cabalistic solution muttered about in my first studio... I think it
    was nitric acid to hypercorrode the bit out? Am I constructing a
    fake memory or will this work. Is there a better idea ["don't break
    bits..."]? I could drill it out with a larger bit but I want this
    tinier hole. 

My thanks,
A-
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