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When testing gold bars and silver bullion for tungsten cores and other fakes, only ultrasound technology can provide conclusive non-destructive results.

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This 10 Troy oz gold bar is filled with tungsten and covered in a thick layer of gold. Gold and tungsten have very similar densities, which means this bar weighs correctly and

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Do the best fakes and counterfeits of precious metal bullion (silver, gold, platinum, palladium) pass a simple specific gravity test (aside from large tungsten-filled gold bars)? I've watched many videos on the

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