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<p>[QUOTE=&quot;Nicholas Molinari, post: 2431924, member: 78411&quot;]Bing, that is basically correct, though it can penetrate deep into a coin while leaving an outer shell of patina mostly intact.&nbsp; It can be treated effectively in most cases with sodium sesquicarbonate solution.</p><p><br /></p><p>I think Insider was just using the term loosely.&nbsp; For clarification, bronze disease, as opposed to other reactions, can spread very fast if not treated or if the conditions which prompted it are not alleviated.&nbsp; I don&#039;t know what chemical reaction caused the blue patina on the OP&#039;s coin, but it isn&#039;t bronze disease, properly speaking (unless a BD outbreak was covered up with a false patina).</p><p><br /></p><p>&quot;Active corrosion&quot; is more or less a euphemism for &quot;bronze disease&quot; in ancient terminology, so far as I understand.[/QUOTE]</p><p><br /></p>

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