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<p>[QUOTE=&quot;Drusus, post: 420878, member: 6370&quot;]I have treated it by pouring boiling distilled water onto a coin I have in a bowl. This will arrest it but will not take off (from my experience) the residue and I dont think it was what I would consider a permanent solution that would make me feel safe about putting the coin away as &#039;problem fixed&#039;. What I did was to take biox and spread it on the whole coin...working only the effected area. I put it on the whole coin just in case there IS some form of lightening or darkening of the tone / patina that it would effect the whole coin evenly. After letting it sit for a bit on the coin I, again, poured boiling distilled water on the coin to rinse it. </p><p>&nbsp;</p><p>The coin was a very worn 6 Kreutzer Franz II. I have had it sitting out for a few months just to monitor it, to date it has not lost its toning, it has not changed color, its clean but still dark as it was when I got it, and the green patches have not returned....I caught it quick enough that you cant even tell where the verdigris was save for a few very light discolorations.[/QUOTE]</p><p><br /></p>

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