depends on how damaged it is. Some slate can be diamond honed. I would suggest you clean it and than test the honing powder to see kind of results you get.

On Thu, Oct 20, 2011 at 12:02 PM, Micah <> wrote:
Have a client looking to restore black slate, it's flat on the surface could it be diamond ground or could one just clean and then hit with a honing powder?

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Frederick M. Hueston PhD
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