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<p>[QUOTE=&quot;desertgem, post: 529538, member: 15199&quot;]If truly junk, and although some collectors feel it is wrong anyway, they are your coins. What is to be remembered it that any rubbing or abrasive cleaning is one way, and can&#039;t be reversed. If just grime, a few minute soak in weak detergent and water, just gentle agitation will remove water soluble dirt. After that rinse with just warm water and allow to dry. If gunk or green still remains a rinse with acetone will remove oil soluble material and tape residue, paint, etc. As mentioned, some prefer to use a green thorn or plastic dental pick to remove gunk. Many do this with mineral oil&nbsp; on the coin to help prevent scratching before the acetone. The black sounds like corrosion on silver coins and can be removed with an acid dip. Acetone doesn&#039;t react with the metal, but acids do, and must be used with care not to overdo the damage.</p><p><br /></p><p>Copper coins are more reactive and usually have a noticeable color change. Toning is very often desirable on coins and should be considered case by case. The dip can also be used to remove toning, but again can&#039;t be undone.&nbsp; Even with the best of technique and care, the end result is sometimes uglier than the original, and reveal hidden damage. &quot;Cleaning&quot; has a wide range, like cleaning your skin using a gentle soap and water or a potato peeler. Avoid coin &quot;potato peelers&quot;.<img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie8" alt=":D" unselectable="on" unselectable="on" /></p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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