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CraigJ, the acrylic should take care of that.

That was my first thought when I saw this. To the person that asked about using just copper, I recommend the acrylic backing for this very reason.

I like the idea of letting them oxodize, especially since you can always polish 'em up again later if you don't like it. However, if you decide that you've gotta keep 'em the way they are, I'll talk...