Colors of cent can vary. If they are green they were affected with water. Yellow looking silver coins could be affected with sulfur in the air on the east coast states. Burned, salt, vinegar, even soda can alter colors. Even storing them in albums can alter the colors. Some turn purple colored when stored in the soft 2X2 flips from PVC damage. Color change from fingerprint marks, food grease from contact with hands. Even saliva can darken a coin. Glue is sometimes added to coins. Just so many things, but altered are not a good thing for a coin to a true coin collector.
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