Message:

<p>[QUOTE=&quot;Pavlos, post: 4585810, member: 96635&quot;]The &#039;bumps&#039; are nothing to worry about, the coin is 2200 years old, corrosion occurs, probably from some impurity metals in the coin. It are corrosion products forming at the grain boundaries under the surface, and it results in raised surface grains. Atleast that is what I remember from back in university when I was working on solid-state inorganic chemistry.[/QUOTE]</p><p><br /></p>

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