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<p>[QUOTE=&quot;Oldhoopster, post: 2624734, member: 84179&quot;]I apologize, Just having a little fun with Chemistry and probably should have added a smiley face.&nbsp; While there are relationships between the Atomic number (number on the periodic table) and properties, a direct correlation isn’t always true.&nbsp; It works for the theoretical density of #28 Nickel (8.92 g/cc) and #29 Copper (8.91 g/cc), but copper density is approx. 125% greater than that of #30 Zinc and #12 Magnesium is approx. 63% of that of #13 Aluminum.</p><p><br /></p><p><br /></p><p>The densities of commercially available copper, nickel, and the 75%Cu/25%Ni alloy are all around 8.91-8.95 g/cc, so I agree with you that a clad planchet and copper planchet of the same thickness would be about the same weight I also agree that it’s a big “IF”, whether it is even possible for an excess copper runout layer to make it through the rolling process and be punched to the correct thickness.&nbsp; My personal feeling is that simplest explanation is usually the correct explanation and this is not a pure copper quarter sized planchet, but it’s hard to certain with these pics.[/QUOTE]</p><p><br /></p>

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