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<p>[QUOTE=&quot;Coinchemistry 2012, post: 1980255, member: 28107&quot;]You are assuming that all artificial toning is the same as normal oxidation of the coin, and this is not true.&nbsp; Artificial toning is often unstable as opposed to natural toning which is stable under normal numismatic storage conditions.&nbsp; This suggests that chemically the two are different.&nbsp; Artificial toning might result from the same mechanism depending on the technique, but there are many different ways to artificially tone a coin.[/QUOTE]</p><p><br /></p>

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