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<p>[QUOTE=&quot;desertgem, post: 2039112, member: 15199&quot;]It seems that some are intermingling the initial color when minted with the case of original color that has changed ( toning) over time. I will accept the first , but would argue the second, especially concerning the effects of copper, which tones by covalent chemical bonding with substances such as sulfur to produce a color change. Whereas, Gold and copper bond with metallic bonding ( sea of electrons concept), which is normally not part of elementary inorganic chemistry. I tried to find a reference that didn&#039;t involve quantum chemistry much and found this one</p><p><a href="http://www.webexhibits.org/causesofcolor/9.html" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.webexhibits.org/causesofcolor/9.html" rel="nofollow">http://www.webexhibits.org/causesofcolor/9.html</a></p><p><br /></p><p>Hopefully it will explain it.&nbsp; Yes, gold can have different coloration depending on the amount of silver or copper added to it, jewelry counters are filled with examples,&nbsp; but as long as gold is the majority metal, color change ( toning) should not occur <i>naturally </i>.[/QUOTE]</p><p><br /></p>

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