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<p>[QUOTE=&quot;davidh, post: 2649081, member: 15062&quot;]A date and/or mint mark can be chemically pulled from any coin - copper, nickel, silver or gold.&nbsp; The process of minting results in different densities of the metal on and around the devices and dates.&nbsp; Acid treatment can selectively etch the less dense part leaving the denser part visible.&nbsp; That&#039;s the process law enforcement uses to raise a serial number from a weapon the number has been filed off of.[/QUOTE]</p><p><br /></p>

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