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<p>[QUOTE=&quot;Oldhoopster, post: 8241807, member: 84179&quot;]Do you have a reference link?&nbsp; All I&#039;ve been able to find is the cent is 97.5%Zn 2.5% Cu, not specifically the core.&nbsp; It does seem that 2.5% may be high for the plating, but I haven&#039;t found anything saying the zinc is alloyed with that much copper, nor anything about a comp change later in the 80s</p><p><br /></p><p>I found this in an old CT thread.&nbsp; It appears to be a quote from David Lange&#039;s book</p><p><i><b>A practical solution was found in a cent planchet that was nearly pure zinc, with just a thin copper plating. In fact, the zinc base was .992 zinc and .008 copper, the trace amount of copper being included to facilitate bonding of the copper </b></i><b><i>plating</i></b></p><p><br /></p><p>This is the entire thread.&nbsp; I copied part of post 3 above</p><p><a href="https://www.cointalk.com/threads/composition-of-the-1982-cent.25829/" class="internalLink ProxyLink" data-proxy-href="https://www.cointalk.com/threads/composition-of-the-1982-cent.25829/">https://www.cointalk.com/threads/composition-of-the-1982-cent.25829/</a></p><p><br /></p><p>I also checked out the Cu-Zn phase diagram and it looks like adding 2.5% Cu would yield zinc and a Zn-Cu alloy (epsilon brass or epsilon zinc?), not a homogenous alloy. (The 0.008 Cu referenced above does appear to be a homogenous alloy)</p><p><br /></p><p>Thanks[/QUOTE]</p><p><br /></p>

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