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Vedigris on coins

It's the green stuff that grows on coins and I am wondering if anybody has had any problems with it getting larger inside a slab?
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<< <i>If the corrosion is active, it will continue to grow in the slab. >>
Thanks much, I just wasn't sure about that.
did an advanced search but couldn't find the image(s) of the kind of pure mineral oin used on copper coins.
will someone point me in the right direction please.
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