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<p>[QUOTE=&quot;Cloudsweeper99, post: 682623, member: 3011&quot;]I am not a chemist.&nbsp; It would be interesting to get the answer from someone who is.&nbsp; But I don&#039;t believe gold oxidizes in the presence of oxygen, which is what normal tarnish/toning is.&nbsp; So technically, I don&#039;t think pure gold really tones.&nbsp; If a gold coin tones, it is more likely that it contains some other metal or impurity, regardless of what the fineness is stamped on the coin.&nbsp; That said, I think gold is somewhat reactive with certain acids, so perhaps handling them or exposing them to an environment that contains certain acids will cause them to discolor.[/QUOTE]</p><p><br /></p>

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