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<p>[QUOTE=&quot;borgovan, post: 457101, member: 13016&quot;]It&#039;s a judgment call...</p><p>&nbsp;</p><p>After awhile, they will accumulate the oil from your skin, which will damage the coins.</p><p>&nbsp;</p><p>If you handle circulated coins with them, they will turn green (if copper coins) or gray/black (if silver coins.) They will also pick up small particles of dirt, as you noted.</p><p>&nbsp;</p><p>If you&#039;re only dealing with modern proofs, they should last a long time, and your main enemy will be perspiration and oil from your hands, seeping through to the outside. One solution to this is to wear latex gloves underneath the cotton, but this makes the sense of touch diminish remarkably, and you risk dropping the coins if you are not careful. This is, by the way, a great argument for handling coins over a padded, sterile surface. </p><p>&nbsp;</p><p>They&#039;re okay being washed, but they won&#039;t ever be new again. I would recommend discarding them and buying new ones, especially if you&#039;re handling a lot of copper.</p><p>&nbsp;</p><p>Have fun![/QUOTE]</p><p><br /></p>

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