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<p>[QUOTE=&quot;Spark1951, post: 5331274, member: 90692&quot;]<i><b>That </b></i>is what is known as zinc rot.&nbsp; Did you weigh it?&nbsp; I’ll bet it weighs 2.5 grams.&nbsp; Because it is micro-plated with copper, the tiniest scratch or splitting of the plating exposes the zinc core and self-destruction has commenced.&nbsp; You are looking at, as others already identified, corrosion of the core, well advanced, and incurable.&nbsp; This is not a result of the minting process.&nbsp; It occurs after the coin has left the Mint = PMD.</p><p><br /></p><p>The Mint contracts with vendors to produce the blanks.&nbsp; They punch out zinc discs and then plate them and send to the Mint.&nbsp; The Mint upsets the discs (gives them rims) and are then known as <i><b>planchets. </b></i>1983 was the first full year for Zincolns. There weren’t supposed to be any minted on full copper alloy, but several from both Philly and Denver have been found.&nbsp; Those are the ones worth searching for, but it’s like lottery odds of finding one.</p><p><br /></p><p>The good news is, from circulation, you can find and preserve/conserve Zincolns in good condition, although, it gets harder to do that every year.&nbsp; Zincolns were <i><b>made </b></i>to self-destruct (imo), a lot of folks don’t like them, and, consequently, don’t save them.</p><p>...Spark[/QUOTE]</p><p><br /></p>

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