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<p>[QUOTE=&quot;desertgem, post: 1348540, member: 15199&quot;]Nic-a-date works only with the Copper-Nickel coins. Nickel has physical properties that striking pressure changes the crystal structure of the copper-nickel atoms, leaving more raised portion ( such as the raised date) more resistant to certain corrosive liquids such as Ferric Chloride ( Nic-a-date) or acids, than the areas such as the fields around the date. So the chemical etches away the area around the former raised date, leaving the area of the date visible.</p><p><br /></p><p>Silver/copper mixes do not have these changes in the crystal structure from striking, nor would nickel clad coins.</p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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