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<p>[QUOTE=&quot;Jamy Smith, post: 25499155, member: 162785&quot;]I was thinking of the rainbow streaks on the cleaner coins might be acetone, but I notice deep dark streaks too, maybe those (or both) are manganese;</p><p>They had trouble coming up with an alloy of the right density so it wouldn’t confuse the vending machine calibration, I think is the only reason they put that in there</p><p><br /></p><p>The second picture gives better contrast, reality is somewhere in between</p><p><br /></p><p>Top are dirty,</p><p>Middle are once tumbled with soap,</p><p>Bottom are twice tumbled without soap the 2nd time,</p><p>Shiny Kennedy and pocket nickels for comparison</p><p><br /></p><p>I got a handful of badly wore and dirty coins I’m going to mix in a batch monomints so I can follow individual coins, the barely legible marks should tell if there’s undue wear going on[/QUOTE]</p><p><br /></p>

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