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<p>[QUOTE=&quot;GDJMSP, post: 2499847, member: 112&quot;]My primary point Kurt was that the sniffer is incapable of telling AT from NT, the TPGs know this. Unfortunately, many collectors do not know this. And whether you call the toning, the silver sulfide, a foreign substance or not doesn&#039;t matter for the sniffer will not detect it.</p><p><br /></p><p>As for the &quot;in and on&quot;, when a coin tones the metal of the coin itself is chemically changed, physically altered, it goes from being one thing to being an entirely different thing. That is &quot;in&quot;.</p><p><br /></p><p>Now if someone were to attempt to create effects similar to toning (coloration) by applying a foreign substance to the surface of the coin, whereby it is the substance itself that is colored and not the metal of the coin that colored - that is &quot;on&quot;. In other words this substance would sit in top of the metal, not alter the metal itself like toning does. And something that sits on top of the metal, this is not even artificial toning of the coin, it&#039;s nothing more than painting the coin.</p><p><br /></p><p>And although I&#039;m sure you already know this, I&#039;m writing it for the benefit of those who do not. Artificial toning and natural toning, both, do exactly the same thing - they physically alter the substance of the metal to make it change colors. And this is why AT cannot be differentiated from NT by a machine, regardless of how sophisticated that machine may be.</p><p><br /></p><p><br /></p><p>edit - I will also add that no person, regardless of the level of their expertise, is capable of determining AT from NT with certainty. The best anybody can do is make a guess.[/QUOTE]</p><p><br /></p>

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