Thanks, Ed! Very interesting and informative reply. Do we really know where the gold comes from that is used to make foil, wire, etc? A great many of the US gold mines have been shut down over environmental concerns.
Also, what about casting grains? Folks on this thread and past threads have mentioned using them. Don't some of them contain copper? I know that fumed copper is extremely toxic (Amy of Zoozii's found out the hard way from using copper inclusions and posted her experiences a while back).
I'm sure casting grains that aren't absolutely pure gold, or even gold made with the mercury process, can be used for fuming with REALLY GOOD ventilation and maybe other precautions. They seem like an interesting choice, but wanted to be sure about the potential risks.
Linda
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