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<p>[QUOTE=&quot;kanga, post: 786392, member: 9270&quot;]I&#039;ve never used it, but as I understand it Nic-a-Date is an acid that works particularlly well with nickel alloys.</p><p>During the striking of the coin the (crystaline?) structure of the metal changes and the change varies according the pressure applied in different areas of the coin.</p><p>Nic-a-Date takes advantage of those variations exposes relief that was removed by wear.</p><p>The field around the date gets etched more than the date itself.</p><p>But the final result is a grainy, porous surface where it was used.[/QUOTE]</p><p><br /></p>

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