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<p>[QUOTE=&quot;Kaleun96, post: 7673018, member: 92635&quot;]If anyone was following the Seleucid lots at the recent Leu auction back in May, you may have seen some with pretty heavy &quot;coppery&quot; deposits on some otherwise harshly cleaned coins. I was fortunate to win one of these and had a go at removing the deposits.</p><p><br /></p><p>My process was to use ammonium thisoulfate (AT) and toothpicks. I was mostly banking on this either not working at all (i.e. doing no harm) or helping remove some of the deposits, I didn&#039;t expect I&#039;d remove it all since these are apparently copper and not horn silver.</p><p><br /></p><p>I mixed a 10% solution of AT with water by weight and would soak the coin for 1-3 minutes before rinsing it off and using toothpicks to dislodge anything loose. In the end it took about 2 hours of cleaning and 5 or 6 baths in the solution.</p><p><br /></p><p>If I couldn&#039;t remove the copper, I was hoping at least to dull the shiny surface. This was by far the shiniest coin I have ever received and it was not due to having any lustre. In my experience, AT will leave a dark, dull, film on the surface of a coin that can be easily removed with light rubbing but even when removed the surface typically does lose its shine. Oddly enough, in this instance I also saw yellow &quot;toning&quot; in places where there was previously neither toning or copper deposits. This can be removed easily but for now I&#039;m leaving it as it gives the coin an &quot;old cabinet toning&quot; look.</p><p><br /></p><p>Before:</p><p><img src="https://leunumismatik.com/source/images/auction/26/01315q00.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" />&nbsp; </p><p><br /></p><p>After:</p><p><img src="https://artemis-collection.com/wp-content/uploads/1105_antiochos_viii_tetradrachm_resized_3.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" />[/QUOTE]</p><p><br /></p>

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