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<p>[QUOTE=&quot;TIF, post: 1881048, member: 56859&quot;]I&#039;m not so sure that is what happened to your coin, Z.&nbsp; It is possible that the raised portions of the coin corroded more rapidly than the rest.</p><p><br /></p><p>When metal is formed in the manner of coin striking, the metal in the areas of relief are less compacted, if you will.&nbsp; Between the relatively less compacted metal, the exact alloy, and the local environment of its last millennium, it could lead to this etched appearance.</p><p><br /></p><p>Another possibility is that it initially had a hard patina covering all surfaces but then something in its environment mechanically scraped away the patina from the high points, allowing new environmental factors to corrode the relatively fresh surfaces which would then be unprotected by an oxide layer.[/QUOTE]</p><p><br /></p>

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