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<p>[QUOTE=&quot;Clawcoins, post: 3548267, member: 77814&quot;]from mid1982 on the cent was made with a zinc core, and a thin 8 micron thin plating.</p><p><br /></p><p>Zinc reacts to steam ... like in your washer/dryer type steam.&nbsp; The US Mint has done tests to make sure they go through the minting process which involves cleaning and drying (steam) ... at least for the first time.&nbsp; hopefully.</p><p><br /></p><p>But zincolns will have these primary issues, which *you will see ALL THE TIME*</p><p><a href="https://www.coinworld.com/news/us-coins/2016/08/unexpected-bumps-on-coins-surfaces-vary.all.html" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.coinworld.com/news/us-coins/2016/08/unexpected-bumps-on-coins-surfaces-vary.all.html" rel="nofollow">https://www.coinworld.com/news/us-coins/2016/08/unexpected-bumps-on-coins-surfaces-vary.all.html</a></p><p><br /></p><p><b><font size="3">5. Plating blisters</font></b></p><p>Plating blisters develop in the coin in the immediate aftermath of the strike, as gas expands between the core and poorly bonded plating. Among domestic coins, <i><u>plating blisters are the exclusive province of copper-plated zinc cents</u></i>. Blisters are generally small and subcircular, with a smooth surface and soft outline. They can occur anywhere on the field and design. The design continues uninterrupted as it crosses a blister.</p><p><br /></p><p>Example:</p><p>[ATTACH=full]942941[/ATTACH]</p><p><br /></p><p><br /></p><p><font size="3"><b>6. Occluded gas bubbles</b></font></p><p>Solely the province of solid-alloy coins, occluded gas bubbles form just beneath the surface and push up the overlying metal immediately after the strike. Like plating blisters, the surface is smooth and the edges soft. The design is uninterrupted.</p><p>[ATTACH=full]942942[/ATTACH]</p><p><br /></p><p><font size="3"><b>7. Corrosion domes</b></font></p><p>Contaminants trapped beneath or penetrating the surface of aluminum, <i><u>plated zinc</u></i>, and plated steel coins can react with surrounding metal to form an expanding front of spongy, corroded metal. The resulting solid dome will superficially resemble a hollow plating blister or occluded gas bubble. In many cases the corroded metal bursts through and may fall out, leaving a crater.[/QUOTE]</p><p><br /></p>

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