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<p>[QUOTE=&quot;desertgem, post: 20966987, member: 15199&quot;]It also could have been dipped in Ferric chloride or similar reactant used in making printed circuit board. The process was invented in 1936 in England. The substance being reduced will have a small amount of variation of the bronze cent thickness since the surface is not flat and level, so it will not be a perfect image as original.In the WWII times, the melting/mixing of the metals&nbsp; might have had areas that had more of one component than the other. I have had quite a bit of copper etching building my first computer in early 1970 and electronic accessories for my Amateur Radio license. The answers above are extremely likely to be correct IMO,</p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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