>>60889150
>Platinum is denser than gold and half the price
Touche! But platinum is extremely hard, extremely high melting point and white. It still would not pass either the ping or the snip test and you would need to alloy it with something to pass the density test.

I honestly don't think it's feasible to use platinum to make a counterfeit gold coin, but I concede, platinum is currently less than half the price of gold and could concievably be used to make super counterfeit gold coins that would pass the density test, but not the ping test.

I should point out that RARELY, real coins can fail the ping test due to internal crystal structure of the blank. It is extremely rare.
https://youtu.be/FwC-I_s6k0g