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<p>[QUOTE=&quot;desertgem, post: 821636, member: 15199&quot;]Borgovan, I think if you look in Google or other search for &quot;work hardening&quot; or &quot;stress hardening&quot; of nickel, it might make more sense. It isn&#039;t so much a change in density, but a change, it appears, in the crystal arrangement of the metal under force , such as from striking such coins, and as mentioned in one of RLM&#039;s posts, the date area is an area that is more susceptible to this hardening than the surrounding fields.. I think this was discussed in another thread, I can&#039;t find, but not all were in agreement, but I find this explanation more satisfying to me.&nbsp; When annealed, nickel has a low ductility, but when stressed, it hardens significantly. </p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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