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<p>[QUOTE=&quot;Owle, post: 1397427, member: 22004&quot;]First use mild cleaning agents like acetone, then if that doesn&#039;t work, try an ultrasonic cleaner with increasingly effective solutions and/or cleaning agents, I hear NCS uses jewel luster at high temperatures, I don&#039;t know if anyone has tried doing that in a 50G or greater confined space.</p><p><br /></p><p>Coin doctors use extremely toxic chemicals like mercury compounds, arsenic, and so forth to tone gold, which should always be considered as an option but requires a gas mask.</p><p><br /></p><p>Lastly, certainly orbital sanders have their place, as well as vices, ball-peen hammers, screw drivers, hack-saws, muriatic, nitric, and sulfuric acids.&nbsp; Of course the coin doctors know all the tricks--but don&#039;t expect them to share them here![/QUOTE]</p><p><br /></p>

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