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<p>[QUOTE=&quot;CHAMELEON, post: 726296, member: 11032&quot;]If you saw the toning change on a coin that was in a holder, it was not an AT coin. AT coins do not change. There a 4 different coin doctors I know of that have successfully got there coins graded on multiple occasions. Before I identified them as coin doctors I submitted coins from 3 of them, and got stars from each of the 3 different sources. After acquiring more coins from each of these sources I began to suspect that their coins were not natural, so I did what I call the &quot;torch test&quot; on each one to determine the originality of the toning. </p><p><br /></p><p>You see, there are several different factors that play a role in the toning of coins. Storage is one. Canvas bags, cardboard holders, velvet or felt holders, wooden boxes, and roll wrappers all play a roll in toning. The amount of light and the spectrum of light that hits the coin is another. Ever notice at shows the dealers that sell rolls of coins? Almost always the end coins are gold toned because they are repeatedly placed under the lights at the shows. Elements in the air also play a roll in toning. Moisture, sulfur content, and other elements can accelerate toning. One of the biggest factors to affect toning is temperature. I had over 50 very colorful coins that I sent to NGC come back in the middle of summer that lost all the vibrant and neon colored toning. One SMS quarter actually much more colorful, but every other coin had turned dark or murky looking. I believe it was because the coins sat in the back of the mail truck for too long in 100+ temperature.</p><p><br /></p><p>After testing of&nbsp; some of my toned coins of lower value, I discovered that AT coins do not change. I tested toned examples from the 3 different sources that had previously received star designations at NGC by taking a pen torch flame (with a nice size flame) and holding the flame to the color on the coins for 2-3 seconds. The colors on the AT coins did not change in the slightest bit. However, applying this same test to every single naturally toned coin resulted in some sort of noticeable change. Some coins would become more colorful. Some coins would change colors slightly, or become darker. The color on some coins would simply disappear. There was no pattern in any coins tested that would allow the change of the toning to be predicted, but in every single naturally coin tested there was some sort of change in one way or another. AT coins are nots susceptible to changing when exposed to extreme changes in temperature like NT coins are, so I highly doubt that they would be susceptible to any of the other factors that play a role in the toning process. Any time I question the originality of the toning on a coin, this test quickly answers my questions. Until someone can prove me wrong I will stand by my statement that AT coins do not change over time, but NT coins do. If you don&#039;t believe me, try this test yourself. It is better than 95% accurate.[/QUOTE]</p><p><br /></p>

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