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<p>[QUOTE=&quot;Ancient Aussie, post: 2512339, member: 80147&quot;]I am posting this as it might be a help to any of you that have a similar problem, about January this year I received a coin from a vcoins dealer in the US that I have bought coins from before. The coin looked good when I got it</p><p>and for $64 US plus postage I thought was a bargain for a Vespasian 72 AD Altar coin 24mm, 10.71g, in VF condition. This coin had been on the website for a few years and in the advertisement it did mention some smoothing. Anyway I kept it out of the coin flip (cardboard type) for a couple of months. I have to mention that our summers in Victoria Australia are very hot and windy, so the ideal type of cooling is evaporative which can add extra humidity inside the house, but I have had coins sitting around in these conditions for years without a problem. Any way I finally put it in a coin flip with a couple of others, a five months ago I had a look at the coin and to my amazement it had like a little volcano of bluish-green throthing and very active just under Vespasian&#039;s nose so I quickly took it out (it had burnt through the clear window) and put it in Sodium Sesquicarbonate mixture.</p><p>After two weeks of changing the mixture, I had not lost all the patina but the dark green was breaking up to become a speckled green/light green (ugly). I have had it wrapped in paper towel for over four months now with no sign of BD, although the conditions inside the house are the exact opposite to summer as I have central ducted heating which really dries the air, anyway I will post the coin as I got it and the next one down is the ugly result of hopefully beating BD but it has a little crater under Vespasian&#039;s nose where the acid was eating into the coin. I am in two minds as to strip the rest of the patina (put it back in the mixture) or put it back in a coin flip before summer. I would appreciate your thoughts on it.[ATTACH=full]534577[/ATTACH] [ATTACH=full]534578[/ATTACH] [ATTACH=full]534579[/ATTACH][/QUOTE]</p><p><br /></p>

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