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<p>[QUOTE=&quot;lrbguy, post: 2871715, member: 88829&quot;]I did.&nbsp; They&#039;re not.&nbsp; The hard green substance we have been calling &quot;Verdigris,&quot; does not contain chlorine ions.&nbsp; What we have been calling &quot;Bronze Disease&quot; is only the chloride or chlorate compound on the surface.&nbsp;&nbsp; That is the way it is regarded in the literature conservators use.&nbsp; Those of us who have not adopted that convention, might want to get with it.&nbsp; (Or not, as they choose.)&nbsp; BTW the acid that produces copper acetate is, drumroll, acetic acid (think vinegar).&nbsp; And if that is in the air, it will react with any exposed copper, with or without the interference of PVC.</p><p><br /></p><p>Pishpash gave a fine take on the problem in non technical language.&nbsp; Bravo dear lady![/QUOTE]</p><p><br /></p>

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