My question is about toning. I have heard terms such as "cabinet toning" which seems to be a sort of darkening of the coin.. then some ancients have other types - such as this coin that I own - which I think is very attractive: My assumption is that this is a reaction of the silver wash on the coin with something in the environment.. cabinet wood, something in the earth where it was found? Correct me if I am wrong. So this coin is about 1800 years old or so.. Then I see examples like this (NOT my coin): a coin 140 years old. Does the modern "metal" used react differently to the environment? I would not think so as Google tells me Morgan Dollars are 90% (or so) silver. How does this happen? is this even real?