To test 400 oz gold bars, one assumes the tester will have enough sophistication to be able to determine the vast thermal, stiffness, hardness and electrical property differences between gold (very soft) and tungsten (very hard).
And if there is any question, a 1/8” simple drill bit will solve the conundrum in a few seconds.
We're not talking about a gold plated tungsten bar. If 10 oz of tungsten is inside your gold bar, how does that change the thermal or electrical properties of the gold around it? Can you really detect a hard slug inside a softer bar?
And if there is any question, a 1/8” simple drill bit will solve the conundrum in a few seconds.
Which part of the 400 oz bar is the tungsten hidden in? Or are you turning the bar into swiss cheese?