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<p>[QUOTE=&quot;desertgem, post: 1926137, member: 15199&quot;]The &#039;whitish&#039; material on the obverse might be zinc, but it isn&#039;t from any internal mix with copper for the coin, not from a 5% zinc coin or even from a much higher zinc content. Zinc is many steps more reactive than copper, and in any natural corrosive reaction such as water or wet soil ( my suspicion), zinc would go into solution and leave any copper rather than be deposited on the copper or copper being dissolved leaving zinc. Unless it was a chemistry experiment with strong sodium hydroxide which would deposit zinc onto the copper. SO the cent has either corroded in&nbsp; acidic soil , or was placed in strong alkaline in a lab, but the weight says it is a corroded normal cent for 1974S. Sorry. Welcome to the forum.[/QUOTE]</p><p><br /></p>

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