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<p>[QUOTE=&quot;desertgem, post: 1561270, member: 15199&quot;]Yes, when the mercury cooled below its boiling point it would condense back into a liquid, but probably on the walls of the room it was being done. Smelters which used mercury to separate/concentrate gold and then boil it off, used vents and condensers ( like the alcohol stills ) to both keep it from worker&#039;s air and to return it to liquid form for reuse.</p><p><br /></p><p>One of the most frightening nights at my Gem and Mineral Society&#039;s &quot;Gold group meeting&quot; was a commercial video demonstrating how to use mercury in your panning concentrates to pick up the gold and then boil the mercury into the air from a large cast iron skillet on a propane BBQ burner unit. He did use &quot;safety&quot; technique of leaning to the side as he talked about what he was doing so the mercury vapors (cooled to microscopic drops) inthe air couldn&#039;t enter his lungs. I did stand up after it was over and explained the errors. Luckily no one there had any mercury.[/QUOTE]</p><p><br /></p>

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