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Message:: [QUOTE="Just Carl, post: 106256, member: 4552"]MrSpud: Your friend that has coins in a safe with black spots on them? I don't think he is telling you the entire story. If they are proof coins in the sealed from the Mint plastic, no moisture of any kind could have gotten to the coins to produce the wierd resurlts of black spotting. Also, the coins in the Dansco Albums to have the same results indicating there is something in that safe besides moisture. Moisture will not produce black spots on coins. Coins being made of different meterials would normally react differently to the same contamination or reative agent. Banks do NOT add moisture to the air to  preserve paper or maybe in your area they do for who knows what reason. Moisture does NOT preserve paper, it also helps distroy paper. Paper, parchments and other documents are kept out of moisture to elimate acidic reactions. Your friend is not telling you the entire story or is unaware of something in his house of great danger to his family. As I have said, NONE of my coins in bank vaults have shown any signs of toning, spotting, corroding or anyting else for the last 50 or more years.[/QUOTE]