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<p>[QUOTE=&quot;bear32211, post: 2092405, member: 73759&quot;]I have always wondered about any coin with toning. I&#039;ve wondered if it is natural of if it was caused by &#039;outside&#039; sources. I have a friend who works with metal and he asked me if I had a coin. I gave him a Washington quarter. He then grabbed a gas torch, lit it and put the heat to the quarter I had given him. I watched as the heat from the torch turned the finish of the quarter to the, what we all would call, a rainbow tone after just a few minutes. He shut the torch off and said, &quot;there, a toned coin&quot;. I was stunned. So that begs the question, &quot;How do you know if the coins you get are natural toned and those that have been possibly manipulated&quot; ?[/QUOTE]</p><p><br /></p>

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