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<p>[QUOTE=&quot;1865King, post: 8441860, member: 103207&quot;]The correct term is corrosion.&nbsp; And yes, you&#039;re looking at corrosion.&nbsp; Rust is a generic term but the same general idea.&nbsp; Every metal will corrode over time if exposed to the right environment.&nbsp;&nbsp; The quarter in question could have been exposed to salt water either in the ocean or dropped on the street in the winter.&nbsp;&nbsp; I&#039;ve even pull coins like that out of pool drains (chlorinated pool water).[/QUOTE]</p><p><br /></p>

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