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<p>[QUOTE=&quot;hotwheelsearl, post: 4938574, member: 75143&quot;]This coin had the absolute <i>most</i> encrustation I&#039;ve ever seen in my life. This wasn&#039;t even dirt or rock; it was multiple layers of the most intense oxdiation - copper, iron, and probably a few other oxides deposited on the entire surface of the coin.</p><p><br /></p><p>There was enough evidence of silver that i knew this could be good, and I was pretty sure I saw a &quot;PVS&quot; on the legend, indicating a Philip the Arab. It is broken, but its kinda neat because it allows me a glimpse into the (good) silver core.</p><p>[ATTACH=full]1186870[/ATTACH] </p><p><br /></p><p><br /></p><p>After soaking in Sodium Hydroxide for around 24 hours, it still had major iron oxide deposits remaining. It looked alright, but I wanted more</p><p>[ATTACH=full]1186871[/ATTACH] </p><p><br /></p><p><br /></p><p>Finally, after soaking in Sodium Thiosulfate overnight, 99% of all the deposits were removed. </p><p>[ATTACH=full]1186872[/ATTACH] </p><p>[ATTACH=full]1186873[/ATTACH] </p><p><br /></p><p>Now, the coin looks pretty decent. The main downside of the Thiosulfate is that it gives the silver a rather dull gray appearance; however I prefer this to a coin covered in horn silver and oxide deposits.[/QUOTE]</p><p><br /></p>

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