Re: removing scratches from "large" copper plates
IntaglioPrintmaker,
The polishing steps you listed look good. I'm not sure how thick the copper is 20oz doesn't mean anything to me. If you can lay it flat and have some way of holding it so it doesn't slid, I would suggest trying a 6" pneumatic DA sander. Try using some 400 grit sandpaper, which is the same grit as the Emory. If the 400 grit paper doesn't take the scratches out move back to 220 or 320 grit. In fact I might even try to using a 3/8" drill motor with a 4" sisal wheel mounted on it with some Emory compound first. Go easy, as the sisal wheel cuts real fast.
John
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