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Years ago I read about a halogen leach mirror test to detect gold in the field. It used iodine dissolved in a alcohol and water mixture to leach gold from a ground up sample of rock. the leachate was then evaporated on a pyrex watch glass using a bunsen burner, If gold was present a gold mirror would form. I am interested in getting detailed information about how to perform this test in the field. Any information on this would be greatly appreciated,. Best Regards Jim