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<p>[QUOTE=&quot;desertgem, post: 1520910, member: 15199&quot;]The &quot;rotting&quot; reaction is of course done by synegystic bacteria ( and maybe a few fungi) breaking down the cells of the onions, and metabolizing the sugars therein.so in the closed container, the oxygen level would decrease and then the anaerobic organisms would finish the job. The terms oxidation and reduction in chemistry doesn&#039;t always refer to the addition or removal of oxygen, they refer more to the transfer of electrons. I believe that BadThad has used a microprobe to determine various components of verdigris/toning/corrosion on a coin, but he would have to comment on that since my reference is via private communication and he has not yet published it.</p><p><br /></p><p>jim[/QUOTE]</p><p><br /></p>

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