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<p>[QUOTE=&quot;USS656, post: 3246152, member: 6641&quot;]Doug, I hardly ever believe in black and white as you would suggest.&nbsp; The larger chemical concentration/humidity/temperature at which the AT chemical reaction occurs (I feel often) produces different results than small concentration over prolonged periods of time.&nbsp; Can you for certain tell the difference between AT and NT as I described it above, no.&nbsp; NT can look like AT and AT can look like NT but from my experience I feel I can say with a level of comfort that a coin is at least suspect of AT.&nbsp; </p><p><br /></p><p>If someone takes the time to control the environment (chemical, temperature, and humidity) well enough to expedite and duplicate what natural toning patterns look like, then I agree it can be hard to tell the difference.&nbsp; Often, the person doing this creates the effect of a stick of dynamite versus a firecracker.&nbsp; Both the same reaction, just differing amounts with differing results.&nbsp; Both toning, just with a different look.</p><p><br /></p><p>This looks like AT: (Stick of Dynamite effect)</p><p>[ATTACH=full]850879[/ATTACH]</p><p><br /></p><p>This looks like NT: (more like the slow natural progression)</p><p>[ATTACH=full]850881[/ATTACH]</p><p><br /></p><p>Interesting thing about the second and third coin is that they were in a holder that had foam for the coins to sit on.&nbsp; The foam is likely the chemical source for the toning.&nbsp; The dime is much more spotty but still has a more natural progression. Someone may look at the dime as questionable while the quarter looks more natural.</p><p><br /></p><p>[ATTACH=full]850882[/ATTACH][/QUOTE]</p><p><br /></p>

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