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<p>[QUOTE=&quot;BadThad, post: 528302, member: 17261&quot;]Verdigris is composed of copper compounds of acetate, carbonate, sulfate and chloride. Pure water or moisture in of itself does not cause verdigris, however, impurities present in water (namely carbon dioxide) can cause verdigris and it also acts of a sort of catalyst for the reaction, mainly as a transport mechanism.</p><p>&nbsp;</p><p>Verdigris can absolutely spread, especially in the presence of moisture. The humidity in air is sufficent. If the above mentioned compounds are present, they can migrate to any surface the rate of which would be primarily defined by the amount of water around the coins, which can act as a transport mechanism. Bottomline, keep coins with verdigris separate and protect them from air and moisture.</p><p>&nbsp;</p><p>That said....verdigris is NOT a living organism, it&#039;s simply the result of a chemical reaction. Matter cannot be created from nothing and it cannot &quot;grow&quot; without being fed. A coin that has the verdigris removed and then protected from air/moisture in a device like an Airtite holder will NOT &quot;regrow&quot; verdigris. It&#039;s not possible since there&#039;s no &quot;feed&quot; materials to produce the reaction.[/QUOTE]</p><p><br /></p>

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