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<p>[QUOTE=&quot;desertgem, post: 1150237, member: 15199&quot;]It is a question that will never be settled. The chemicals that cause toning in AT and NT coins are not exclusive to one or the other. Toning from the album is from the chemicals ( often sulfur containing cardboard) and are usually the same ones involved in NT. Temperature affects all chemical reactions, so it affects NT and AT both. There is no known scientific device that can tell if toning is AT or NT, only PET scanners that can tell if one is telling the truth as to their intent if they are responsible. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" /></p><p><br /></p><p>Length of time is not a reliable measure as time doesn&#039;t cause toning, it just measures how long the reactants are acting.</p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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