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<p>[QUOTE=&quot;Orielensis, post: 4464430, member: 96898&quot;]Welcome to CoinTalk!</p><p><br /></p><p>The cleaning experts might chime in eventually and tell you more, but if I were you, I wouldn&#039;t panic. I doesn&#039;t look as though this nice denarius were affected by any active corrosion.</p><p><br /></p><p>I&#039;d suspect that what you see likely are either the remains of the coin having been improperly stored in a plastic flip for a long time, or that the seller has applied some powdery substance to the surface of the coin to enhance its eye appeal. The latter is cringed upon and more common with bronze coins – search for &quot;maybelline&quot; in this forum and you&#039;ll find some discussions.</p><p><br /></p><p>In any case, a short bath in acetone will likely help and most probably not hurt the coin.</p><p><br /></p><p>(Edit: Or it is a fourrée and the patina of the bronze core is seeping through the silver coating – but to me it doesn&#039;t look like that in your pictures.)[/QUOTE]</p><p><br /></p>

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