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<p>[QUOTE=&quot;imrich, post: 2785515, member: 22331&quot;]There is an appreciable difference between generating further damage to a coin covered in residue, and removing the residue to view underlying damage, without further evidence of damage.</p><p>&nbsp;</p><p>A coin having terminal underlying damage can be aesthetically improved, but damage is irreversible, generating an assumption of &quot;cleaning&quot; rather than &quot;conservation&quot;. The difference is whether the &quot;patient&quot; has improved health (i.e. further damage or not).</p><p><br /></p><p>The commercial &quot;conservators&quot; only improve the appearance, not reverse the condition, but we don&#039;t label their efforts as cleaning, and issue grades to their efforts. </p><p><br /></p><p>As I stated earlier in this thread, I&#039;ve several expensive Gold coins at a TPG, being notified that residue removal is suggested to facilitate a grade. It doesn&#039;t require an I.Q. test to answer the query.</p><p><br /></p><p>We will see the possible difference in the coins re-grade.</p><p><br /></p><p>JMHO[/QUOTE]</p><p><br /></p>

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