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<p>[QUOTE=&quot;-jeffB, post: 26325649, member: 27832&quot;]Yeah, Nic-A-Date on silver is a non-starter. I think the experiments reported here used peracetic acid (white vinegar and hydrogen peroxide). I was thinking of trying nitric acid, but I have very little of it (from a silver/gold test kit), and I don&#039;t like using it (bad, poisonous smells).</p><p><br /></p><p>The upshot seems to be that etching silver doesn&#039;t work as well as etching cupronickel, the restored dates are really fragile, and TPGs don&#039;t care to authenticate the coins. I have ideas about why restoring silver is harder, but I&#039;m not enough of a metallurgist to back them up. There&#039;s also a risk of miscreants &quot;restoring&quot; any date they want onto a coin by patterning the etching...[/QUOTE]</p><p><br /></p>

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