It is hard to tell the true color of the nickel from the pictures. It looks most likely like environmental damage but I can't be sure. A black beauty nickel would have a more even gray color rather than the gradient brown. Also, refrain from trying to alter the color or surface of a coin in any way as it can damage the coin and take away it's value. It is generally ok to take off surface verdigris or other substances with a product called verdicare, or you could try acetone. Be sure to do research into the more acceptable ways to clean coins and you can always ask questions here if you have any.























