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Author Topic: advice how to clean an roman antoninianus  (Read 753 times)

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Offline karaya75

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advice how to clean an roman antoninianus
« on: April 04, 2021, 01:58:13 pm »
i have this coin full off encrustations, very hard to remove. how can i remove it?

thank you



Online Ron C2

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Re: advice how to clean an roman antoninianus
« Reply #1 on: April 04, 2021, 07:27:31 pm »
do you know the emperor and silver level?  Is it silver or billon

If it's indeed reasonable purity silver, have you tried some lemon juice on a Q-tip?
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Offline karaya75

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Re: advice how to clean an roman antoninianus
« Reply #2 on: April 04, 2021, 07:37:34 pm »
hello

 its a gordianos 3

Offline nikopolis1

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Re: advice how to clean an roman antoninianus
« Reply #3 on: April 08, 2021, 09:39:13 am »
Get some formic acid.Dilute to around 10-20 % .The acid will dissolve this incrustations.But monitor the coin,1-2 hrs and should be ready.

Offline otlichnik

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Re: advice how to clean an roman antoninianus
« Reply #4 on: April 08, 2021, 09:46:07 am »
Personally, I would go gentler and use Ron's lemon juice, or vinegar, applied via q-tip.  This may soften the green to the point that a fingernail or bamboo skewer will remove some.

I wouldn't go harsher until that technique, or even leaving drops of lemon juice or vinegar on the green for a few minutes, had proved to not work.

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Offline B-Chicago

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Re: advice how to clean an roman antoninianus
« Reply #5 on: April 25, 2021, 12:59:04 am »
me and my harshness never uses cotton on silver but it's all a matter of opinion anyway

my first approach would be to soak it - in DW -  for a long time and see how that materializes with short lemon juice baths in between

that should really put a dent in that gunk


Online Ron C2

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Re: advice how to clean an roman antoninianus
« Reply #6 on: April 25, 2021, 01:16:42 pm »
I'm rather hoping to OP didn't just fly in to get advice and vanish.  It's much more polite when some feedback comes after he tries a few things.
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