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<p>[QUOTE=&quot;gxseries, post: 439176, member: 4373&quot;]You can do something similar when you do a copper wash, i.e. wash a bunch of copper coins together and add detergent etc with the nickel plated coin and you get copper stains. Not too sure how it works but someone here that know their chemistry can possibly explain better of why that happens.[/QUOTE]</p><p><br /></p>

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