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<p>[QUOTE=&quot;-jeffB, post: 2056242, member: 27832&quot;]<i>By</i> people who &quot;knew&quot; that it was important to clean metal items, and <i>with</i> nitric and sulfuric acid. They certainly do get rid of any surface deposits, along with the surface itself.</p><p><br /></p><p>People in the 19th century, indeed through most of the 20th century, had different ideas about how to take care of coins. That&#039;s one reason that &quot;original&quot; coins are as rare and desirable as they are.</p><p><br /></p><p>Me, I spend some of my time wondering which of our current &quot;common-sense&quot; coin-handling practices will draw the ire of those who find our coins a century down the road. I wonder if I&#039;ll live long enough to see the big reveal about &quot;slab damage&quot;...[/QUOTE]</p><p><br /></p>

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