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Posted in response to Cleaning Copper Rock? from Nancy on September 17, 2010 at 09:16:58:

Re: Cleaning Copper Rock?

If you have native (metal) copper and you want to brighten it up and remove dark staining, you might try a mild acid soak before you do any grinding or polishing. Vinegar would be the first thing I'd try on an inconspicuous spot. Might take several applications.

From MikeR - September 18, 2010 at 10:55:25
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