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Toning (coin)

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A Morgan dollar with iridescent toning

Toning on a coin is the change of colour brought about through oxidization, which forms a thin layer of tarnish on the metal's surface. Toning can range from beautiful to ugly, and thus can alternately add or detract from a coin's value.[1]

References

  1. ^ "What is Coin Toning? How Does It Affect Coins and Their Value?". CoinNews.net. Retrieved 20 October 2015.
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