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<p>[QUOTE=&quot;robinjojo, post: 8324780, member: 110226&quot;]If the BD reappears, you might want to try a longer distilled water soak before resorting the the washing soda.&nbsp; I think of the washing soda as the last resort.&nbsp; It is quite effective, but as I noted there is a downside using it.</p><p><br /></p><p>Those small areas BD should stabilize with the distilled water.&nbsp; I have one ancient bronze that had really serious and persistent BD.&nbsp; It required extensive soaking in washing soda and distilled water. It shows no signs of BD now, but it was at a cost.</p><p><br /></p><p>[ATTACH=full]1475047[/ATTACH]</p><p><br /></p><p>That flat rectangular pit on the reverse is where the BD was concentrated.&nbsp; The pit itself is a lamination, where the metal, due to a structural flaw, separated from the flan either at the mint during striking or in circulation.&nbsp; That depression apparently attracted moisture and oxide deposits over centuries of burial, allowing the chemical process of BD to develop.&nbsp; When I received the coin the BD was not apparent.&nbsp; It seems that the coin was cleaned and possibly had the surfaces sealed - I am not sure.&nbsp; But it did not take long for the BD to appear.[/QUOTE]</p><p><br /></p>

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