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<p>[QUOTE=&quot;Kurisu, post: 6530126, member: 117063&quot;]Many coins that are restored properly will straight grade.</p><p>With practice (and especially professional grading services) one can recognize when a coin has been restored improperly.</p><p>The short concept is that restoring does things to bring coins back to their original surface, aged or not.</p><p>Cleaning implies abrasion of some sort and that&#039;s quite easy for a lot of us to recognize.</p><p><br /></p><p>Most methods of restoring do not include physically altering the coin. It&#039;s usually different chemicals designed to remove dirt, biological material, and moisture. Even ultrasonic methods are sometimes used.</p><p><br /></p><p>Sometimes various chemical dips if not done too fiercely can remove tarnish/toning but can then quickly alter the coin&#039;s surface which can then be recognized in a few different ways, besides the experience of looking at thousands of original condition coins.</p><p><br /></p><p>One of the main risks is that any technique removing something on the surface leaves a different appearing surface underneath...and so sometimes gentle spots are actually less offensive than the altered looking surface left behind...typically those coins will not straight grade until they&#039;ve had time to re-age naturally.</p><p><br /></p><p>The term conservation implies some sort of treatment afterwards to protect an item, but the conservation services for the big grading companies typically do not involve any type of treatment, they are really restoration services.[/QUOTE]</p><p><br /></p>

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