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<p>[QUOTE=&quot;alurid, post: 25299041, member: 81991&quot;]I find when I am looking at BU cents there can be a lot of Discolorations on them.</p><p>Some of those &quot;spots&quot; can be caused by grease or other debris on the dies.</p><p>A bit of grease or debris on the die will change the texture of the copper surface which can change the way the metal will tone with time. I also suspect that it is possible to have some residual liquid on the planchets after they have been tumbled clean. There is a few different speculations for what is the cause of toning on the surface of metals, and until someone does a intensive microscopic investigation it will remain just speculation. JMO[/QUOTE]</p><p><br /></p>

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