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<p>[QUOTE=&quot;lordmarcovan, post: 3653969, member: 10461&quot;]Is there any copper in the alloy of these .999 bullion coins?&nbsp; I know they&#039;re 24K gold, but what do they put in the coins to make them durable enough to <i>be</i> coins?</p><p><br /></p><p>I suppose there could be just enough trace alloy of something else in the composition to allow for some subtle toning?&nbsp; (In other words, reactivity to the environment, i.e., &quot;air&quot;, as stated.)</p><p><br /></p><p>Or maybe there&#039;s a difference in color in the gold itself?&nbsp; Is there any color variance in pure gold?&nbsp; I Googled around briefly, but did not find a satisfactory answer to that question. </p><p><br /></p><p>I know there are certainly differences in colors of gold, which is how they make those &quot;tri-gold&quot; rings and things, but that&#039;s due to different purities.&nbsp; But whether two different pieces of <i>pure</i> 24K gold will differ in color from one another is something I don&#039;t know.</p><p><br /></p><p>Perhaps there are just enough trace alloy/impurities to allow for some toning.</p><p><br /></p><p>In any event, it wouldn&#039;t overly concern me.&nbsp; Both are nice.[/QUOTE]</p><p><br /></p>

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