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To: Amark$p who wrote (94995)	9/25/2012 11:50:45 PM
From: mach	Read Replies (1) \| Respond to of 220172

you can use ultrasonic testing (measurement of the velocity of sound) to distinguish between gold-plated tungsten bars, coins, etc versus pure gold. a google search of "ultrasonic gold test" gives many examples: e.g. olympus-ims.com goldmoney.com I would think any large company dealing in physical gold must currently use ultrasonic or a related technique to verify that their bars/coins are not fake. There are probably some unscrupulous dealers out there trying to pass fake gold plated W items as real gold, so caveat emptor and know your source when buying physical. Mark