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<p>[QUOTE=&quot;Insider, post: 2489543, member: 24314&quot;]The vinegar &quot;trick&quot; has to do with the &quot;strike hardening&quot; of the coin&#039;s details.&nbsp; The metal of the coin&#039;s design detail (like its date) and its field is affected/changed below its surface <span style="color: rgb(179, 0, 179)">differently</span> when the planchet is struck. The vinegar attacks the compressed atoms in the metal at a slower rate.&nbsp; Same thing happens on coins seen with &quot;selective corrosion.&quot;</p><p><br /></p><p><span style="color: #b300b3">Edit for clarity</span>.[/QUOTE]</p><p><br /></p>

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