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Whole books have been written about toning coins. The basic answer is, if you don't already know how to do it, DON'T DO IT!! I guarantee you will screw it up, and make it worth much less. If you want to spend a few hundred hours learning, find a coin dealer to teach you the basics, and experiment on a few thousands of dollars worth of coins. Many coin dealers have spent tens of thousands of dollars on toning, or removing toning on coins, not to mention many hundreds of hours of research and testing. So, basically, forget it!
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