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<p>[QUOTE=&quot;-jeffB, post: 2516393, member: 27832&quot;]It&#039;s not that difficult today to get acid that will etch silver -- any &quot;silver and gold testing&quot; kit contains pure (but somewhat diluted) nitric acid to test for silver.</p><p><br /></p><p>I still don&#039;t see why, if it were possible to restore dates on SLQs in this way, we don&#039;t see restored-date SLQs in the market.[/QUOTE]</p><p><br /></p>

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