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<p>[QUOTE=&quot;robinjojo, post: 25416669, member: 110226&quot;]Yes, bronze disease can be very aggressive and sometime appear almost overnight.&nbsp; It is very distinctive, white to a very light green, and, above all, powdery.&nbsp; I&#039;ve noticed that it also has a metallic odor, which is not surprising.&nbsp; This is active corrosion at work, a totally natural process but not one that bodes well for the coins we try to preserve, and it will over time totally eat away the coin&#039;s surface.&nbsp; Also, it will spread to other bronze, copper or brass coins.&nbsp; Coins with BD should be kept separately from other coins, especially if they are on a tray or otherwise in contact with each other.</p><p><br /></p><p>Bronze disease, base on my experience can be treated, or at least mitigated by neutralizing the corrosive process.&nbsp; This is achieved through the used of a distilled water bath, extended with changes of water is needed, as a first step, followed by a thorough drying in a low temperature oven.&nbsp; Then the coin needs to be left out and&nbsp; observed over time for any signs of the disease cropping up again.&nbsp; If that happens, then either a repeat of the distilled water is necessary, or, if it is very deep, the use of a solution of sodium sesquicarbonate and distilled water might be needed.&nbsp; However, this chemical will remove virtually all patina along with the BD if left unattended, so monitoring is essential.</p><p><br /></p><p>Some collectors try to seal the coin with Verdicare or Renwax.&nbsp; I haven&#039;t done that with the coins that I&#039;ve had to treat, and so far so good. If you live in a high humidity climate, something that is becoming common even in more traditionally drier regions, then the treated coins would benefit being stored with some silica packets.</p><p><br /></p><p>Here&#039;s a link to a much more detailed description on steps to treat BD with a solution of sodium sesquicarbonate and distilled water:</p><p><br /></p><p><a href="https://www.forumancientcoins.com/numiswiki/view.asp?key=bronze%20disease%20treatment" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.forumancientcoins.com/numiswiki/view.asp?key=bronze%20disease%20treatment" rel="nofollow">https://www.forumancientcoins.com/numiswiki/view.asp?key=bronze disease treatment</a>[/QUOTE]</p><p><br /></p>

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