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Message:: [QUOTE="GDJMSP, post: 1108183, member: 112"]As long as a coin is stored properly then continued toning is slowed down so much that it becomes almost non-existant. But if a coin is not stored properly then toning will indeed continue but it will almost certainly change to a different kind (a different look or color) because no two environmental conditions are ever the same. Specifically, no. Some have specualted that haze on Proofs is due to the special washing process that the Proof planchets undergo at the mint. But most of that speculation has been regarding the more modern Proofs - say 1970's and on. But as those who collected for a long time know, and as you can see from this coin, haze on Proofs is nothing new. It has been with us for a long time. And since the mint is constantly changing the washing solution that they use, and since this problem has been around so long, I myself am skeptical that the washing solution is the cause of the haze. I also question this being the cause since some Proofs don't ever develop haze at all. For may years I have speculated that haze is nothing more than a particular kind of toning that is fully dependant on certain environmental conditions being present. I just don't know what those specific conditions are. It's the only thing that seems to make sense to me.[/QUOTE]