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<p>[QUOTE=&quot;davidh, post: 528220, member: 15062&quot;]Yes Spock, I did read the article and the links provided, and nothing in the article or the links says anything about verdigris being infectious to previously uninfected areas of copper, nor that it is self-replicating in the absence of carbonates, chlorides or acetates. </p><p><br /></p><p>The fact that verdigris is a fungicide (&quot;Fungicides are chemical compounds or biological organisms used to kill or inhibit fungi or fungal spores&quot;) has absolutely nothing to do with the formation of verdigris in the first place.&nbsp; Your statement, &quot;verdi is a&nbsp; fungicide...but it does spread...&quot; is a total <i>non-sequitur</i>.&nbsp; It makes no sense in itself and provides no insight to the discussion at hand.</p><p><br /></p><p>Verdigris is formed when the coin is exposed to some carbonate, chloride or acetate contaminate.&nbsp; I contend that once the coin is removed from source of the contamination then the further production of verdigris stops (the verdigris present does not spawn more verdigris).&nbsp; Finally I contend that unaffected copper which comes in contact with verdigris on another coin will not become contaminated by that verdigris as long as the contaminate that caused the verdigris is no longer present.</p><p><br /></p><p>My original question remains unanswered.[/QUOTE]</p><p><br /></p>

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