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<p>[QUOTE=&quot;SwK, post: 2347498, member: 22309&quot;]PATINA</p><p><br /></p><p>The light blue / or turquoise patina or pea-green: In the last period of the Roman empire as a consequence of the economic crisis the alloy used to struck bronze coins was no longer good: they initially added lead, but it resulted a metal less strong, that&nbsp; was in a short time used up.&nbsp; To solve this problem and stabilize the alloy, they added arsenic.&nbsp; The alloy was now better, stronger.&nbsp; It was in fact a revolutionary idea.</p><p><br /></p><p>&nbsp;I never saw in my life these kind of patina on coins of the first two centuries of the Roman Empire.[/QUOTE]</p><p><br /></p>

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