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<p>[QUOTE=&quot;Kentucky, post: 2873470, member: 33176&quot;]OK, here&#039;s some slipshod science...</p><p><br /></p><p>There was a thread that concerned cleaning penn...uh cents with vinegar and table salt (NaCl).&nbsp; I decided why not, so I selected two cents (95% copper and plated) in three different groups:</p><p>[ATTACH=full]687289[/ATTACH]</p><p><br /></p><p>I made a solution of table salt in vinegar and immersed four of these coins.&nbsp; After soaking them about an hour, I removed them and rinsed two of them and let the other two dry (the third two are the control...I did nothing to them):</p><p>[ATTACH=full]687291[/ATTACH]</p><p>For some reason I changed their orientation, but the first two to the left are the ones I let dry, the middle two are the control, and the last two got rinsed.&nbsp; This was taken after about a month.&nbsp; I then forgot about them for probably 6 more months, but then decided to see what they looked like:</p><p>[ATTACH=full]687294[/ATTACH]</p><p>The controls, of course, haven&#039;t changed, and the 95% cent doesn&#039;t show any damage, but the ones that were just allowed to dry show some interesting &quot;patina&quot;.[/QUOTE]</p><p><br /></p>

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