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<p>[QUOTE=&quot;medoraman, post: 1805306, member: 26302&quot;]<a href="http://www.crescentcitycoinclub.org/seminars_and_programs/Bronze%20Disease.pdf" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.crescentcitycoinclub.org/seminars_and_programs/Bronze%20Disease.pdf" rel="nofollow">http://www.crescentcitycoinclub.org/seminars_and_programs/Bronze Disease.pdf</a></p><p><br /></p><p>Here is a presentation by a chemist on bronze disease versus patina. A patina is a stable oxide, and bronze disease is a self perpetuating acidic reaction. This reaction will continue until the coin is consumed or the acid neutralized.</p><p><br /></p><p>Another point I would make is Verdicare from Badthad I have had remove bronze disease on green, black, red, and brown patina coins. On not one of the coins did the verdicare affect the patina, even after soaks of over 2 days. However, the bronze disease was removed. So, are you trying to say a coin gets bronze disease over and over, and these layers of bronze disease somehow magically transform into layers of stable oxides instead of damaging acids?</p><p><br /></p><p>Sorry, still not buying it unless someone shows me the chemistry. This subject has been discussed ad nauseum on ancient coin boards, and not once have I ever heard someone suggest bronze disease &quot;builds up&quot; stable patinas.[/QUOTE]</p><p><br /></p>

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