![]() Should You Clean Discolored Coins?ĭon’t attempt to remove darkness or discoloration from any coin. Occasionally, such toning is quite attractive - with colors ranging from light blues and pinks even to rainbow colors. Sometimes coins that are kept in old-fashioned coin folders and albums will also take on some unusual toning. Sitting in a warm and humid environment for long periods of timeĪll of these things can cause a coin to turn a variety of colors - from deep grey or black to mottled or speckled.Contact with caustic chemicals or fumes, such as sulfur or gas.Storage in a paper envelope, PVC plastic, or open-air case.Exposure to intense heat or very cold temperatures. ![]()
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