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<p>[QUOTE=&quot;desertgem, post: 1869417, member: 15199&quot;]I agree that Paul has a very good point here. Dipping does alter the surface of the coin, as the acid does not just work on the silver sulfides and other tone producing agents, it also work on the un-toned silver, eating down the ridges that produce luster. In fact, chemically it would work better on the silver where the toning was removed. </p><p><br /></p><p>What if nanobot molecules could selectively remove the sulfide or oxide portion on a copper /copper alloy cent, without affecting the color of the underlying copper, would it be accepted as dipping is on silver? And I do think it is possible in the next decade <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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