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<p>[QUOTE=&quot;Roerbakmix, post: 4795730, member: 100731&quot;]Together with a friend, I bought this coin of Hieronymus of Syracuse, with the intent of restoring it, and then resell it:</p><p>[ATTACH=full]1164736[/ATTACH]</p><p>HIERONYMUS OF SYRACUSE, AR 10 Litra (215-214 BC)</p><p>Diademed head of Hieronymus left / ΒΑΣΙΛΕΟΣ IΕΡΩΝΥΜΟΥ above and below winged thunderbolt, MI above</p><p>8.43g</p><p><br /></p><p>The problem is obvious: a thick layer of horn silver on the reverse, and some spots on the obverse. However, there were several indications that it would turn out well:</p><p>[ATTACH=full]1164737[/ATTACH]</p><p>1) on the reverse, at 4&#039;o clock, part of the horn silver was gone, revealing a smooth and nicely patinated surface</p><p>[ATTACH=full]1164740[/ATTACH]</p><p>2) on the reverse, at 7&#039;o clock, the border between smooth silver and deposits was rough</p><p><br /></p><p>3) overall, the coin was in good condition with very minimal pitting. </p><p><br /></p><p>I treated the coin the usual way, however, this time a bit nervously since CNG already estimated hammer price which was rather high. Also, the coin was bought not only by me, but also by my friend ... </p><p><br /></p><p>I dropped the coin in a sodium thiousulphate solution, and it immediately turned black (which is a good sign):</p><p>[ATTACH=full]1164741[/ATTACH]</p><p>... also visible are the small parts of horn silver that fell of the coin. </p><p><br /></p><p>After 10 minutes, I removed the coin from the solution (now completely black), and rinsed it under tapwater. The dark layer (Na3[Ag(S2O3)2]) is easily removed, revealing the nice grey patina below (AgS):</p><p>[ATTACH=full]1164742[/ATTACH]</p><p>&nbsp;( a bit yellow due to bad lighting in the evening). There were still some minor deposits left, e.g. at 4-6 o&#039;clock on the reverse.</p><p><br /></p><p>This morning, I repeated the treatment:</p><p>[ATTACH=full]1164743[/ATTACH]</p><p>... with- this as a final result. Suffice to say I&#039;m happy with the results! The final deposit at 3&#039;o clock (the brown deposit) is iron oxide (i.e. rust), which is very difficult to remove, so I&#039;ll just keep it this way.[/QUOTE]</p><p><br /></p>

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