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<p>[QUOTE=&quot;medoraman, post: 981935, member: 26302&quot;]Ok, I will research it. I know the US didn&#039;t have any kind of capability like that for most of its history. You say that .9999 is doable for the last 2000 years, how come only a couple of mints can do it still today? Most bullion is .999.</p><p><br /></p><p>I have never, ever, seen ancient coins have such purity levels, even of coins they meant to be pure gold. .99 maybe, not .9999. Are you saying the touchstone can differentiate between .99 and .9999? I thought touchstones could tell the difference between &quot;pure&quot; gold and about .9 or .95 gold or the like, not advanced degrees of fineness as we are talking.</p><p><br /></p><p>I am all about reminding people of technologies ancients had, vending machines, batteries, electroplating, etc. I just find .9999 gold a stretch. Just because your book lists 1.000 does not mean it is correct to significant digits. Where is the book&#039;s metallurgical data coming from? The fact the mint meant for it to be 1.000? Hard to list that, isn&#039;t it, when no mint on planet earth with today&#039;s technology can achieve such a feat?[/QUOTE]</p><p><br /></p>

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