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<p>[QUOTE=&quot;ToughCOINS, post: 3004079, member: 20480&quot;]I&#039;ve seen enough toned gold to know that it does indeed tarnish naturally, and even does so with only trace levels of other elements in the metal.&nbsp; It is the rate at which gold oxidizes and the circumstances under which it does so that are so different from the other coin metals.</p><p><br /></p><p>Those who contend that gold only tones where impurities are concentrated likely have a limited exposure to toned gold as their reference.&nbsp; Many have seen brilliant gold with a copper spot or two.&nbsp; In those cases, the coin was probably not exposed to the right conditions for the gold to tone, yet the concentration of copper / silver in the subject area was clearly oxidized sufficiently by the same environment that was not able to oxidize the gold.</p><p><br /></p><p>The coin below is toning in and around the protected areas pretty uniformly, and not in a few isolated areas where copper is concentrated.</p><p><br /></p><p>Toned gold coins are much less common because most pieces probably were not suitably exposed for long enough, and because many of those were likely dipped to meet the expectations of those either unfamiliar or unhappy with its natural look.</p><p><br /></p><p>[ATTACH=full]743832[/ATTACH][ATTACH=full]743833[/ATTACH][/QUOTE]</p><p><br /></p>

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