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<p>[QUOTE="-jeffB, post: 1282376, member: 27832"]I agree that .999 and higher purity isn't a practical consideration for monetary use, but there's at least one application where it's quite critical -- semiconductors. <a href="http://www.allchemie.com/group-1b.html#gol" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.allchemie.com/group-1b.html#gol" rel="nofollow">Here's a company</a> that offers gold in four, five or six 9's purity (up to 99.9999% pure).</p><p><br /></p><p>I wouldn't downplay the emotional element, either. As you say, increasing purity doesn't always affect material properties. But the alchemists of old didn't know that, so they drove for centuries to achieve an ultimate state of purity. They couldn't, of course, but the techniques they developed formed the foundations of modern practical chemistry -- which, I would argue, is <i>quite</i> important to us all.[/QUOTE]</p><p><br /></p>
[QUOTE="-jeffB, post: 1282376, member: 27832"]I agree that .999 and higher purity isn't a practical consideration for monetary use, but there's at least one application where it's quite critical -- semiconductors. [URL="http://www.allchemie.com/group-1b.html#gol"]Here's a company[/URL] that offers gold in four, five or six 9's purity (up to 99.9999% pure). I wouldn't downplay the emotional element, either. As you say, increasing purity doesn't always affect material properties. But the alchemists of old didn't know that, so they drove for centuries to achieve an ultimate state of purity. They couldn't, of course, but the techniques they developed formed the foundations of modern practical chemistry -- which, I would argue, is [I]quite[/I] important to us all.[/QUOTE]
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