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<p>[QUOTE=&quot;WuntBeDruv, post: 24738766, member: 115520&quot;]In a previous life I worked as a low level conservator of metals. My issue is with the word &#039;disease&#039; - because it fuels anxiety amongst collectors and implies things about it which simply aren&#039;t true. It isn&#039;t biological in nature and there is no evidence it can spread between objects as a virus or sickness might between people. The appearance of it on numerous coins or objects simultaneously is often &#039;symptomatic&#039; of poor storage conditions than anything else. I just tend to call it active copper alloy corrosion and be done with it.</p><p><br /></p><p>It is interesting what it affects, especially in recently excavated finds. The burial environment is often one possible root cause, as coins and objects tend to acclimatise to the conditions they become deposited in. I think particularly acidic burial conditions often sets a precondition.[/QUOTE]</p><p><br /></p>

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