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<p>[QUOTE=&quot;joecoincollect, post: 2519229, member: 71338&quot;]I always thought NT takes place over decades, not years. Sure, some toning can develop in a matter of minutes, depending on the stimulus, right? So where do we draw the line? Can NT develop in months? One year? The factors seem to be environment/climate, how it&#039;s stored (ie in what type of holder), time, and intention (which would be hard to verify). To me, AT is more apt to take place in the short-term, so I&#039;m always wary of ASEs with rainbow toning. I&#039;m aware that the toning colors and their appearance provide some evidence for making an NT or AT determination. If you put an ASE in a holder with some sulphur in it, as long as you don&#039;t heat it, is that NT? What if it&#039;s hot where you live? I&#039;m confused, sorry. If a coin is put intentionally in a holder that will tone it, but it takes a few years, and the toning looks NT (ie color not too bright or superficial looking) when done, how can we say this is not artificially toned? These seem like very vague terms[/QUOTE]</p><p><br /></p>

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