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<p>[QUOTE=&quot;DonnaML, post: 8133880, member: 110350&quot;]I was wondering exactly the same thing: just how old does a coin have to be before cleaning it becomes an acceptable practice and doesn&#039;t reduce its value? Is it when a coin is old enough to reasonably assume that at some point in its history it was below ground, and someone dug it up? By that standard, I would think it&#039;s OK to clean not only ancient coins but also most medieval coins. It&#039;s only with the Renaissance (&quot;early Modern&quot;) that it becomes reasonable to think that a coin has been above ground, and continuously owned by a series of people, since it was minted. The question becomes, I suppose, whether buried vs. unburied is a fair line to draw to determine whether cleaning is OK vs. not OK.[/QUOTE]</p><p><br /></p>

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