> The electrons almost all travel on the surface of a conductor, not through the core. <
You’re right, Arlis, etc. A conductivity test would be of little use differentiating between gold and tungsten. And that’s something I should have known.
Years ago I read about a sound echo test that could be used to tell the difference between gold and tungsten. I confused that test with a conductivity test. I blame Global Warming for my mis-remembering.
Anyway, that echo test is used on bars. I doubt if it would work on a small, one ounce wafer. A diagram of the sound echo test is here:
http://www.zerohedge.com/news/2013-08-16/gold-or-tungsten-heres-how-know
LOL. I normally just blame my ever increasing senility.