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<p>[QUOTE=&quot;dougsmit, post: 2482852, member: 19463&quot;]This image shows two things.&nbsp; First, BD can attack billon/silver coins which are, after all, alloyed with copper.&nbsp; The insets show the suspect green area before (right) and after (left) a LIGHT touch with the pin point shown in the left image.&nbsp; Notice how the tall spot is now scattered over a much larger area.</p><p>[ATTACH=full]524353[/ATTACH] </p><p><br /></p><p>After treatment with sesquicarbonate, the green is gone and the red deposits are lessened and darkened.&nbsp;&nbsp; </p><p>[ATTACH=full]524354[/ATTACH] </p><p>This coin and all my &#039;survivors&#039; are examined regularly.&nbsp; I recommend placing treated coins in a &#039;hospital&#039; tray and watching them for a couple years before returning them to the general population of your collection.&nbsp; I also recommend you just not buy coins that show BD.&nbsp; Yes, you may be able to &#039;cure&#039; them but human medical science teaches us not to say we are cured of cancer but to talk about being in remission and visiting the doctor on a regular basis.[/QUOTE]</p><p><br /></p>

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