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<p>[QUOTE=&quot;desertgem, post: 1246584, member: 15199&quot;]There have been many past threads on the subject and mechanism of conserving coins. Conserving practices should not cause any damage to the original metal of the coin. True, &quot;never clean&quot; is a good statement to make to people whose background is not known. Conservation firms employ chemists and archivist people who can spend a large amount of time, removing or stopping damage. Average collectors are impatient, and won&#039;t spend the time or effort to develop the chemical and metallurgic knowledge and the physical experience practicing on &quot;beyond conserving&quot; coins, thus they are &quot;cleaning&quot; rather than conserving. Just as grading ability does not not develop after looking at 10 coins, conservation ability doesn&#039;t occur after working on 10 scrap coins. Use the search function for subjects with verdigris ( probably the most common), PVC damage, etc. </p><p><br /></p><p>Cleaning leaves surface damage visible to the experienced grader.</p><p>Conservation leaves no surface damage to the experienced grader.</p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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