Furryfrog02 Posted July 15, 2022 · Supporter Share Posted July 15, 2022 This guy arrived in the mail today. I almost had a heart attack when I bought it. I didn't at the decimal in the bid and accidentally placed a 4 digit bid on the coin. Luckily, it still landed in a reasonable price and I was more than happy to add him to my small but slowly growing collection of denarii. I'm a bit concerned about the green patch on the reverse though. It isn't flakey like BD so I'm not sure if I'm over reacting or not. Is there anything I could/should do? Thanks in advance for the advice! Septimus Severus 198-202 AD AR denarius Rome Obverse: L SEPT SEV AVG IMP XI PART MAX, Laurate head right Reverse: VICT PARTHICAE, Victory walking left, holding wreath and trophy, captive at feet left 7 Quote Link to comment Share on other sites More sharing options...
John Conduitt Posted July 15, 2022 · Supporter Share Posted July 15, 2022 Great coin. The green is just a deposit. It won’t hurt the coin. It looks like it covered a bigger area, perhaps from another coin on top. 2 Quote Link to comment Share on other sites More sharing options...
Benefactor Steve Posted July 15, 2022 · Benefactor Benefactor Share Posted July 15, 2022 (edited) Ummm, probably not a huge deal on an AR coin ... it's already 2000 years old, so I don't think it'll be a biggee (it looks like a nice, cool hard-green bit of personality, to me anyway) Hi => Oh, sweet coin (congrats) NOTE: but $10 says some turd will come after me and tell you to wash it wish verdi-wash, or whatever it's called 😇 Edited July 15, 2022 by Steve 1 1 Quote Link to comment Share on other sites More sharing options...
Furryfrog02 Posted July 16, 2022 · Supporter Author Share Posted July 16, 2022 I thought it looked like maybe another coin was on top of it as well. For how ever many hundreds of years. I'm totally cool with leaving it as it. I think it gives it a bit of "personality" - as long as it doesn't eat the rest of the coin. 1 Quote Link to comment Share on other sites More sharing options...
John Conduitt Posted July 16, 2022 · Supporter Share Posted July 16, 2022 (edited) 8 minutes ago, Steve said: not a huge deal on an AR coin ... it's already 2000 years old Yes I’m not entirely sure how AR these were. Maybe 50%. But it has likely lasted 2000 years with that deposit on it. Edited July 16, 2022 by John Conduitt 1 Quote Link to comment Share on other sites More sharing options...
Romismatist Posted July 17, 2022 · Member Share Posted July 17, 2022 Yes definitely due to another coin on top of this one and a piece remains fused to yours. Not bronze disease at all. I had the same thing happen to me on an antoninianus of Trajan Decius but I used citric acid and a toothpick to carefully remove the deposits. It is possible if you have the fortitude to attempt it. 1 Quote Link to comment Share on other sites More sharing options...
Limes Posted July 17, 2022 · Supporter Share Posted July 17, 2022 It reminds me of a small green spot on a the obverse of my antoninianus of Caracalla. I don't mind. Im not sure what caused it. Is it even possible to have BD on a silver coin? How much inpurity is needed for BD to occur on a denarius or antoninianus? 3 Quote Link to comment Share on other sites More sharing options...
John Conduitt Posted July 17, 2022 · Supporter Share Posted July 17, 2022 (edited) 3 hours ago, Limes said: Is it even possible to have BD on a silver coin? How much inpurity is needed for BD to occur on a denarius or antoninianus? This is a good question and I can’t find an answer. Coins sometimes described as ‘silver’ contain as little as 2% silver, which seems too little even to be called billon. The later antoninianus had less silver than the nummus (5%) which is usually described as bronze, and can get bronze disease. But even earlier Roman silver coins contain a lot of bronze and so presumably this bronze can be affected by chlorides. Does the silver help stop the reaction, or is there a point when there isn’t enough copper for the reaction to continue? Edited July 17, 2022 by John Conduitt 1 Quote Link to comment Share on other sites More sharing options...
Lhevae Posted July 17, 2022 · Member Share Posted July 17, 2022 I've seen some kind of bronze disease on 20% billon that looks almost as silver, but never on higher % silver coins. 3 Quote Link to comment Share on other sites More sharing options...
Furryfrog02 Posted July 17, 2022 · Supporter Author Share Posted July 17, 2022 13 hours ago, Romismatist said: Yes definitely due to another coin on top of this one and a piece remains fused to yours. Not bronze disease at all. I had the same thing happen to me on an antoninianus of Trajan Decius but I used citric acid and a toothpick to carefully remove the deposits. It is possible if you have the fortitude to attempt it. I don't think I have the fortitude! Quote Link to comment Share on other sites More sharing options...
shanxi Posted July 17, 2022 · Supporter Share Posted July 17, 2022 (edited) 1 hour ago, Furryfrog02 said: I don't think I have the fortitude! Here is a silver coin with green deposits that I cleaned with EDTA (https://en.wikipedia.org/wiki/Ethylenediaminetetraacetic_acid) It worked well, and the silver toning was not removed. Edited July 17, 2022 by shanxi 3 Quote Link to comment Share on other sites More sharing options...
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