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<p>[QUOTE=&quot;medoraman, post: 981672, member: 26302&quot;]I am not disagreeing with you Doug, just asking questions. Given the fact Spock pointed out that .999 or .9999 is recent, does anyone have any darkly toned .999 coins? You showed some wonderful coins, but they aren&#039;t pure gold. Refining technology at that age simply wasn&#039;t able to produce that fine of gold. Given that silver will tone black with age, would it be possible for a small inclusion of silver, (found naturally in gold), could cause gold coins to darken?</p><p><br /></p><p>I have observed the same gold coins toning as you Doug. Maybe not as long, but for a long time. I am open to either idea really, that either age and environmental gases cause gold to tone, (gold is not completely inert, just mostly inert), or metal impurities impart the tone. I would just like to know. One picture stays in my mind, that of a newly dug up pot of Roman gold coins, and they were bright gold. Maybe atmospheric gases are the cause?</p><p><br /></p><p>Chris[/QUOTE]</p><p><br /></p>

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