Viking Coder wrote:
>
> > Gold: 19.3 g/cm^3, $8820/kg
> > Tungsten: 19.25 g/cm^3, $110/kg
>
> A 400 oz. 'gold' bar will have a 32.2 grams lighter than a true gold bar.
>
> A 400 oz. gold bar occupies 645.2 cm^3; and has dimensions of 12.2 cm x 33
> cm x 1.61 cm. This makes for a total surface area of 950.744 cm^2.
>
> 32.2g = 1.67 cm^3
>
> A layer of gold 17.6 microns thick on a 400 oz. (minus 32.4g) bar of
> tungsten will produce a 'gold' bar.
>
> So for US$1370 (tungsten) and US$284 (gold) you have produced a 'gold' bar
> worth US$110,000.
>
> This is the reason why gold dealers/banks won't accept gold from just
> anybody off the street.
I'm sure you could test for this with a "seismic" approach - sound
transmission and scattering, such as they use to prospect for oil but on
a smaller scale. It wouldn't detect *what* the error was, but it would
detect a linear discontinuity in the metal content, and the bar could
then get sawn in half to check.
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