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<p>[QUOTE=&quot;hotwheelsearl, post: 7932771, member: 75143&quot;]By no means an expert, but I&#039;ve had a lot of experience cleaning coins of all types.</p><p><br /></p><p>Silver is pretty sturdy, and I&#039;ve found that you can subject it to a plethora of harsh chemicals with only minor impact to coin fabric and surfaces.</p><p><br /></p><p>This Trajan drachm I subjected it to a veritable <i>gauntlet</i> of chemicals:</p><p>sodium hydroxide, acetic acid, citric acid, sodium thiosulfate, and at one point I even splashed some <i>gosh-darn Tarn-X </i>on it.</p><p>[ATTACH=full]1371867[/ATTACH] </p><p>[ATTACH=full]1371866[/ATTACH] </p><p><br /></p><p>The only downside here is the artificial toning which cropped up; it&#039;s started to darken over the past few months. But, I see just extremely minor surface porosity, that barely even registers.[/QUOTE]</p><p><br /></p>

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