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Message:: [QUOTE="rbm86, post: 44064, member: 854"]JBK and ngolflo, you make good points about the challenge of where to "draw the line" between NT and AT.  Because of that difficulty, many characterize toning as "market acceptable" or "not market acceptable".  That being said, I think, in general, toning that takes place gradually over a number of years is usually considered "NT", whether that takes place in a mint bag, a Whitman Album, or an antique coin cabinet.  Any process that tones a coins quickly via heat or chemicals is generally considered "AT", and would include stuff like baking a coin in a potato, torching a coin with heat, or "toning" a coin with cigar smoke (yuck!).  However, there are exceptions -- NT coins being "bodybagged" for "questionable color" and AT coins from skilled coin doctors finding thier way into PCGS, NGC, and ANACS holders. All things considered, there are "AT" or "non-market acceptable" toned coins which are obvious, and the website helps those in detecting such obviously AT coins.  Even if you like certain AT coins (really nothing wrong with that) you should not pay an "NT price" for such coins.[/QUOTE]