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<p>[QUOTE=&quot;hotwheelsearl, post: 7939878, member: 75143&quot;]Well, I revise my statement. It won&#039;t cause <i>major</i> damage to the coin, but could cause some very minor surface roughness as a result of loss of the original patina.</p><p><br /></p><p>The below coin is &quot;billon&quot; or a rather low silver content coin with mostly bronze.</p><p><br /></p><p>I left this coin in sodium thiosulfate for about 5 days straight. Despite what chemistry and others have said, I have found thiosulfate to be highly effective against red/orange iron oxide rust.</p><p>[ATTACH=full]1374059[/ATTACH]</p><p>[ATTACH=full]1374058[/ATTACH]</p><p>None of the detail was lost, although it did remove some of the patina - hence a very mild case of surface roughness.</p><p><br /></p><p>[ATTACH=full]1374057[/ATTACH] Nothing that Renaissance wax can&#039;t save.</p><p><br /></p><p>So, basically, you are likely to lose some original patina, depending on the circumstance. Only you can decide if its worth it or not.[/QUOTE]</p><p><br /></p>

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