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Message:: [QUOTE="NorthKorea, post: 2511889, member: 29643"]If you placed a coin into a manila envelope for 40 years, there's a chance the coin might come out black/brown, there's a chance the coin might have no surface changes (depending upon the quality of paper and the storage environment, there's even a chance you get rainbow toning, and of course, anything in between. The result of the experiment is that in 40 years, you don't know what you'll have (in terms of how the coin looks), and you didn't attempt to accelerate the toning process, so it would be likely accepted as NT... though who knows what the market will consider "acceptable" 40 years from now. The "AT" aspect of such an experiment is when an individual then places said manila envelope into a higher heat/humidity environment and regularly check the "progress" of the toning on the coin. In that case, I'd say the intent was clearly to accelerate the rate of toning, though the market may still find the end result favorable. What I want to know is how many "resets" can a coin go through before the peaks get too short to have nice diffraction patterns?[/QUOTE]