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<p>[QUOTE=&quot;SeberHusky, post: 2316139, member: 72959&quot;]God knows where it came from. BUT for what it&#039;s worth, I uncovered a few of my childhood cars from my backyard with a metal detector back in 2009. </p><p><br /></p><p>After a decade underground, they were intact, but once I exposed the cold metal that had been about a foot underground in the spring to hot water and soap, the paint started bubbling and the diecast metal did in a few places as well. The cars felt like a stucco ceiling after they dried. </p><p><br /></p><p>If the coin was an old metal detector relic, it might be soil acids that affected the weak 1800s metal and kind of ate at it and left those patterns behind (like tree or grass roots?). I do know the soil under pine trees has super high acid content from decaying needles and sap, which is why grass can&#039;t grow there. If it was on commercial land for a large business, you know how much fertilizer gets put into that grass.[/QUOTE]</p><p><br /></p>

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