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<p>[QUOTE=&quot;JayAg47, post: 8105185, member: 112342&quot;]I have this intermediate tetradrachm in my collection for a few months now, I got this from Brian Bucklan for really cheap, thanks to the horn silvering.</p><p>I did not try to remove the layer as I was scared of damaging the coin, But after my recent addition of a <a href="https://www.cointalk.com/threads/classic-attica-owl-tetradrachm-and-a-possible-die-match.390458/#post-8104236" class="internalLink ProxyLink" data-proxy-href="https://www.cointalk.com/threads/classic-attica-owl-tetradrachm-and-a-possible-die-match.390458/#post-8104236">classical owl</a> I decided to give it a try. </p><p>So I soaked the coin in a warm solution of sodium thiosulfate for 30 min, and repeated it for 3 times with a bit of washing in between. </p><p>This really got rid of most of the deposits, but left a lusterless darkened coin, and to correct this issue, I cleaned it with sodium bicarbonate which got rid of the darkness and also restored some shine. </p><p>This is the before image,</p><p>[ATTACH=full]1409759[/ATTACH] </p><p><br /></p><p>After image,</p><p>[ATTACH=full]1409760[/ATTACH] </p><p>Intermediate tetradrachm</p><p>Pi-style V</p><p>c. 350 - 297 B.C.</p><p>I&#039;m really surprised to see the amount of details hidden under thick layers of horn silver, especially the tendrils on Athena&#039;s helmet (which really helped me attribute &amp; date my otherwise generic tet), and also on the reverse the legends AΘE really popped up along with the detailed feathers on the owl&#039;s head and breast. </p><p>Initial mass- 16.9g</p><p>Final mass- 16.57g, nearly a hemiobol level loss in material, although I&#039;m happy to trade it for the gain in details.[/QUOTE]</p><p><br /></p>

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