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Message:: [QUOTE="Clawcoins, post: 3613391, member: 77814"]I know [USER=28047]@rickmp[/USER] stated in 2018 the 20 micron thick which he referenced a comsol.com blog.  But all the US MINT documentation reviews thickness tests and their end result selection of 8 micron thick plating. <ul> <li>The US MInt does reference the Royal Canadian Mint's multi-ply tests of 20 microns but for nickels</li> </ul>[ATTACH=full]967757[/ATTACH] <ul> <li>and some nonsense tests for quarters with 5, 8 & 10 micron thick copper</li> </ul>[ATTACH=full]967764[/ATTACH] <ul> <li>there were reviews of 25 micron copper over steel</li> </ul>[ATTACH=full]967760[/ATTACH] <ul> <li>but I've found no documentation of a 20 micron thick cent.</li> <li>but many references of an 8 micron thick plating</li> </ul> [ATTACH=full]967766[/ATTACH] [ATTACH=full]967767[/ATTACH] [ATTACH=full]967769[/ATTACH] [ATTACH=full]967770[/ATTACH] [ATTACH=full]967771[/ATTACH] <ul> <li>all except for the comsol.com blog</li> </ul>[ATTACH=full]967772[/ATTACH] <ul> <li>but the US MINT disregarded security (forging) for the cent coin and seemed to disregard the "bullet points" of the comsol blog.</li> </ul>[ATTACH=full]967776[/ATTACH] I did a quick scan of a couple other US MInt docs but couldn't find a 20 micron reference.so .. I'm just curious where the 20 micron plating came from to correct my knowledge.[/QUOTE]