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<p>[QUOTE=&quot;Roerbakmix, post: 4312985, member: 100731&quot;]Some of you know I&#039;d like to restore ancient coins. With COVID-19, I didn&#039;t had much time on my hands as a MD, but as dusts settles down, I found myself looking for a fun (and cheap at €10) cleaning project. This one looked promising: (sellers photo):</p><p>[ATTACH=full]1096634[/ATTACH] </p><p>It looked like a nice combination of horn silver with some copperoxides and iron oxides. </p><p><br /></p><p>Yesterday, it arrived, but only five minutes before my evening shift started, so I didn&#039;t really had time to look at it. </p><p><br /></p><p>[ATTACH=full]1096635[/ATTACH]</p><p>This morning, I took my own photograph. Looking more closely, the encrustation on the left of the bust looked less promising, but pitted and rough. </p><p><br /></p><p>After a short soaking in a hot sodium thiosulphate anhydrate solution, the coin immediately turned black (which is a good sign, indicating that there is indeed horn silver present on the coin: sodium ditiosulfatoargentate is the result of sodium thiosulphate reacting with silver chloride). </p><p>[ATTACH=full]1096637[/ATTACH] </p><p><br /></p><p>In the next step, I removed the sodium ditiosulfatoargentate by mild abrasion with sodium bicarbonate...</p><p>[ATTACH=full]1096636[/ATTACH]</p><p>... and bummer, the coin turned out to be a fourree antonianus. I chuckled for a bit, because probably, ~1700 years ago, someone likely had the same thought, and then threw the coin away. </p><p><br /></p><p>So I&#039;ve previously shared restoration successes; this is one of the two coins so far which did not turn out better than the coin I started with (in my own opinion, that is). I actually like how the coin looks in the second photo, so I&#039;ll try to repatinate it (and keep it in my own collection as a fun reminder). </p><p><br /></p><p>I&#039;m a bit stuck with the identification. The emperor looks a bit like Philip the Arab, but I&#039;m not really into that period. Any help appreciated <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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