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<p>[QUOTE=&quot;Lehigh96, post: 1517337, member: 15309&quot;]To me the stability of an AT coin simply means that the AT was achieved by the use of gas &amp; temperature rather than the application of a chemical to the surface of the coin.&nbsp; The gas method once finished eliminates the toning source and arrests further toning.&nbsp; The application of a chemical to the surface of a coin will cause the toning to continue to advance unless the chemical is completely removed/neutralized which is not easy to do.[/QUOTE]</p><p><br /></p>

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