Luc Van den Borre wrote:
>
> | I'm sure you could test for this with a "seismic" approach - sound
>
> Or just hit it with a (small) hammer - I bet tungsten will sound different from
> gold.
> And you could test the electrical conductivity. This is done in arcade machines
> (coin drops past a magnet).
Poking it with a pointy stick would work too in scraping past any gold
plating, although it would leave annoying marks all over your gold bar.
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