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Artificial patination and bronze disease
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Aleph:
There seems to be a great number of artificially patinated coins on the market in recent years. While I am not opposed in theory so long as it is non destructive and tastefully done, the problem I am encountering is what happens to this patina when the coin is treated for bronze disease. What I am finding is that following prolonged treatment in distilled water and dilute sodium sesquicarbonate (just enough to ensure the solution is not acidic) at room temperature is bringing out a splotchy green patina. Should I try to repatinate the coins? Should I try and push this treatment longer to complete the removal of the new patina? Any suggestions?
I see this topic was also briefly mentioned in this past thread
https://www.forumancientcoins.com/board/index.php?topic=56295.msg350027#msg350027
Thanks!
Ron C2:
The problem with artificially patinated coins, in many cases, is real and stable patina is removed before it's applied. Often this is done to get something like a faked desert patina.
I prefer to avoid such coins altogether if I suspect any patina manipulation.
For BD in general, see here for some good tips:
https://www.forumancientcoins.com/numiswiki/view.asp?key=bronze%20disease
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