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<p>[QUOTE=&quot;andrew289, post: 1685324, member: 6463&quot;]I tone coins regularly on my window sill from May to October and during the summer on an upper shelf in my garage. I&#039;m not sure about copper but I can tone clad and silver in about a month in the window and 6-8 weks in the garage with rotating observse up to reverse up almost weekly. </p><p><br /></p><p>I have some 2009 proof sets that i want to sell and noticed last weekend that the lincoln comem cents had all toned in the holders in climate controlled environment. No toning on any clad coins.[/QUOTE]</p><p><br /></p>

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