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Message:: [QUOTE="GDJMSP, post: 7768637, member: 112"]You're quite correct, toning most definitely progresses. And if you allow toning to progress unchecked then it will eventually, and literally, destroy the coin. Toning is corrosion - that's just a simple fact - and corrosion will destroy metal. That said, it is also important to understand another simple fact - all coins begin to tone the instant they are struck - all of them. And since the primary cause of toning is the air itself toning cannot be stopped - at least in a practical sense. But if you're willing to put your coins in an legitimately airtight container then you can stop toning dead in its tracks. You can however, with proper coin storage, slow toning down so much that for all practical purposes it becomes immaterial. Meaning, you'd be hard pressed to tell the difference in your lifetime.[/QUOTE]