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<p>[QUOTE=&quot;-jeffB, post: 3976254, member: 27832&quot;]That seems to be the answer we&#039;ve settled on in previous discussions here. It would explain why devices are enhanced on an etched nickel, and why they aren&#039;t on silver (which doesn&#039;t work-harden in the same way). Of course, that doesn&#039;t mean it&#039;s correct -- but then why <i>does</i> the date come back when you etch a dateless nickel?[/QUOTE]</p><p><br /></p>

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