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<p>[QUOTE=&quot;Clawcoins, post: 3425219, member: 77814&quot;]according to past US MINT documents the copper plating is 8 microns thin.</p><p>Copper changes toning/corrosion very easily.&nbsp; Have you ever seen houses with copper sheets on them (this roofing article even correlates it to pennies) ? <a href="https://www.huberroofing.com/blog/2017/11/16/everything-you-need-to-know-about-copper-roofing" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.huberroofing.com/blog/2017/11/16/everything-you-need-to-know-about-copper-roofing" rel="nofollow">https://www.huberroofing.com/blog/2017/11/16/everything-you-need-to-know-about-copper-roofing</a></p><p><br /></p><p>Luckily roofs sit in one place and not much happens to it.</p><p>On the other hand, coins end up in about anything and everything that you can&#039;t think of thus affecting their color, and physical damage.&nbsp; How many times have you seen ppl put coins in their cupholders underneath their soda pops .. and what&#039;s in soda?[/QUOTE]</p><p><br /></p>

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