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<p>[QUOTE=&quot;Kentucky, post: 2871904, member: 33176&quot;]Then ask another one.&nbsp; I am an organic chemist and as such know more about organic chemistry than inorganic chemistry.&nbsp; Verdigris is a loose term for corrosion on copper and can be copper acetate, copper chloride or copper carbonate (guess which acid copper carbonate comes from...drumroll) or a combination of any of these, or other copper containing compounds.&nbsp; I think [USER=17261]@BadThad[/USER] can speak to this much better than me, but it&#039;s kind of like the difference between tarnish and toning.&nbsp; If you like it, it&#039;s toning...if you don&#039;t like it, it&#039;s tarnish.&nbsp; If you have a green coloration on a coin that is stable, it&#039;s a patina called verdigris, if it has a tendency to spread, it&#039;s bronze disease.&nbsp; Green toning on copper coins makes me uneasy and I would just as well remove it.&nbsp; I have removed green toning using VerdiCare, but, once again I will let [USER=17261]@BadThad[/USER] address that.&nbsp; BTW, sodium sesquicarbonate is the accepted treatment for bronze disease as you would have seen if you had been on here for awhile.[/QUOTE]</p><p><br /></p>

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