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<p>[QUOTE=&quot;mrbrklyn, post: 1000013, member: 4381&quot;]the minting process for Buffalo Nickets had a raised date and mint mark.&nbsp; Once they wore off, the coin was unidentifiable.&nbsp; But the different pressures on the metal of the coin creates an invisible, substrata matrix of metal, and you can raise the date sometimes in a light acid bath, which will unevenly remove enough metal to see the date, making a virtually worthless coin at least a place holder in your coin album.</p><p><br /></p><p>I wonder if the same can be accomplished with xray refraction.</p><p><br /></p><p>Ruben[/QUOTE]</p><p><br /></p>

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