Proper care and handling of copper coins

Rocelle writes: Under what circumstances will a full proof red penny undergo discoloration in a matter of days? Such a penny I bought for over USD3k was delivered to me in a coin album (packed in a cardboard material with plastic cover). I took a cursory look at it paying more attention to the writings […]
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How much does light wiping and/or cleaning detract from the value of silver coins?

Bill F. asks: How much does light wiping and/or light cleaning detract from the value of silver coins? How do you identify this? Disturbing the surface of a coin by cleaning is obvious to trained numismatists and knowledgeable collectors. Yes, it reduces the desirability of the coin and therefore the price. There are situations where […]
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