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<p>[QUOTE=&quot;desertgem, post: 1800466, member: 15199&quot;]Arsenic is sometimes used in lead alloys for tensile strength purposely, and as nonpurposely&nbsp; a &#039;come along&#039; extraction in the mines. I ancient times, it was probably not considered, but not we know that some ( not most) people are<b> hyper</b>sensitive to even microscopic amounts. The first time people contact poison ivy&#039;s<b> urushiol</b>, they may have not immediate reaction, but their immune system prepares for the following contacts and react stronger each time.&nbsp; Trace metals could produce a similar scenario, so it could be other metals or material ( oils, acids, and other chemicals) the ancients coins might have been cleaned with.[/QUOTE]</p><p><br /></p>

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