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<p>[QUOTE=&quot;lordmarcovan, post: 2928060, member: 10461&quot;]I dunno what causes it.&nbsp; Reactivity to the copper in the alloy, I suppose.&nbsp; I&#039;m certainly a fan of that look.</p><p><br /></p><p>As to the Boscoreale coins, I learned about that when I first saw [USER=44357]@AncientJoe[/USER]&#039;s purplish <a href="http://www.colosseocollection.com/p443726947/hcd9ad7c#hcd9ad7c" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.colosseocollection.com/p443726947/hcd9ad7c#hcd9ad7c" rel="nofollow">Vespasian aureus</a>, which still gives me goosebumps.</p><p><br /></p><p>I&#039;ll never be able to afford a Boscoreale coin, most likely, so thanks.&nbsp; Your comparing my modest little half-escudo to that look is high praise.&nbsp; I never considered the similarity.</p><p><br /></p><p>Certainly heat was a factor with the &quot;Boscoreale toning&quot;.&nbsp; I guess the ash at Pompeii that covered those coins was hot enough to cause the toning without being hot enough to melt the coins.&nbsp; I also suppose heat could have at one time contributed to the toning on the half-escudo, who knows. </p><p><br /></p><p>I once bought a hoard of WW2 era world coins that had been stored in an attic for about 50 years.&nbsp; Attic temperatures here in SE Georgia in the summertime can get well up into the 130&#039;s Fahrenheit.&nbsp; Many of the coins in that hoard (which had been stored in old airmail envelopes) were dramatically toned.&nbsp; They ranged from lovely rainbows to coal-black.&nbsp; Of course the old paper envelopes would&#039;ve had something to do with that, too.&nbsp; (And these were silver and base metal coins, not gold.)[/QUOTE]</p><p><br /></p>

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