My hunting buddy found a very nice Silver dollar today, It's posted on eye popping mind blowing. Beautiful silver dollar but it is blackened around the edges. What cause this. Different soil conditions, Wet ground, Chemicals. Any ideas. It just made me wonder so thought i'd throw it out there for discussion. I had found one last week and no discoloration at all. But have seen two this week that were. Both were found in places that no way could they have been counterfeit.