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<p>[QUOTE=&quot;physics-fan3.14, post: 2612694, member: 19165&quot;]No, you won&#039;t find any coins minted at 14k or 18k. The whole point of a gold coin or bullion is to get a bunch of gold - 18k is only 75% pure (which means you&#039;ve got a lot of extra weight in other things, usually copper or silver). </p><p><br /></p><p>At this fineness, you&#039;re talking about an electrum coin. There are quite a few ancient coins minted in electrum, but I wouldn&#039;t recommend calibrating a machine based on those - the fineness varied quite a bit. </p><p><br /></p><p>Your best bet is going to just buy the test ingots.[/QUOTE]</p><p><br /></p>

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