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<p>[QUOTE=&quot;BadThad, post: 982883, member: 17261&quot;]I&#039;ve already put a lot of thought into it. Here&#039;s my educated guesses:</p><p>&nbsp;</p><p>- Chemicals, they have a full lab stocked with everything you can imagine. I&#039;m positive they do use the classic acid/thiourea reagents they make themselves at various concentrations. They also surely have a wide array of custom made reagents, each designed for a specific purpose.</p><p>&nbsp;</p><p>- Ovens - I suspect they do some heating as needed. They probably have the ability to purge and blanket the ovens with various gases or to run them under vacuum. Heat can be a powerful conservation tool if used properly. They may even have some tightly-controlled, pinpoint heat sources they use under magnification to vaporize various deposits.</p><p>&nbsp;</p><p>- Electrolyic cells - I think they may use electrolysis as needed with a highly controlled, customized apparatus and special eletrolytes developed in-house.</p><p>&nbsp;</p><p>- Gases - You can bubble various gases, such as hydrogen, around the coin that will react with and remove many surface deposits. They might have special fluids they use for this depending on the residue to be removed. The fluid could even be heated to specific temperature. The possible combinations of fluids, gases and temperature are endless. This could be a very powerful technique but it would require a lot of scientific thought and testing. If I figured it out, I&#039;d keep it a huge secret too![/QUOTE]</p><p><br /></p>

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