Pennies are made from copper or copperplated zinc. Copper is a highly reactive metal that will oxidize or discolor quickly. When pennies are first minted they have a bright orange-red color. As time passes, the copper reacts with the different impurities in the air. As the coins circulate they encounter oils and acids from people’s hands..
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Take the coins out and place them on the clean, soft cloth. Using the old, soft toothbrush scrub the face of the coin softly. Place the coin in the second container filled with the remaining distilled water. Allow sitting for five to ten minutes. Remove from the bin, place on the soft cloth and allow to dry naturally.. So, the short answer is do not clean your coins, chances are pretty good you’ll bugger them up. One real story I know concerns two (adult) brothers that found a 1930 penny. They telephoned a dealer to get a valuation with a view to selling it, and the dealer concerned agreed to travel to their home to make an offer on it.