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Hardened Dirt On Celtic Silver - Soak In Olive Oil Or Soapy Water?

 
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United Kingdom
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 Posted 11/30/2022  1:32 pm Show Profile   Bookmark this topic Add gerio2 to your friends list Get a Link to this Message
I've a small Celtic silver coin the detail of which (and hence clearer ID) is partly obscured by hardened dirt.

I'd quite like to soak it to see if the dirt would gradually come off. Olive oil for a couple of weeks was very successful with some Roman bronze but I am unsure of how it will work on silver.

Any thoughts? Or soaking in water? Soapy water? Or just don't go there? (!)

PS I'm pretty sure it is dirt rather than oxidisation.
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 Posted 11/30/2022  2:09 pm  Show Profile   Bookmark this reply Add keith12 to your friends list Get a Link to this Reply
We would love
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 Posted 11/30/2022  5:02 pm  Show Profile   Bookmark this reply Add Hondo Boguss to your friends list Get a Link to this Reply
gerio, how about starting with a conservative approach - acetone soak overnight just to see. You might be pleasantly surprised, and at the very least no harm will be done.
Inordinately fascinated by bits of metal with strange markings and figures
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 Posted 11/30/2022  5:40 pm  Show Profile   Bookmark this reply Add T-BOP to your friends list Get a Link to this Reply
with the acetone soak and maybe use a little toothpick and Q-tip going over .
Tony

For Butch & Jim rest in peace .
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United Kingdom
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 Posted 12/01/2022  05:33 am  Show Profile   Bookmark this reply Add gerio2 to your friends list Get a Link to this Reply
Thanks for the replies - acetone I have. Will try that. Thank you!
Here are some pictures as requested.
CELTIC, Corieltauvi, 45-10 B.C., Silver unit, South Ferriby Type, 14mm, 1.09g


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 Posted 12/01/2022  07:33 am  Show Profile   Bookmark this reply Add sel_69l to your friends list Get a Link to this Reply
I suspect that the black stuff is a complex of silver / copper oxides and sulfides. Shallow corrosion scarring may be underneath.
Remember, this coin was probably recovered from soil contact burial, and most probably had a primary cleaning already. That would explain it's current appearance.

Try a soaking in sealed small container of acetone first, but I don't think that will do much good.
To remove, it will require physical removal with a Q-tip. Patience needed.
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United Kingdom
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 Posted 12/01/2022  2:22 pm  Show Profile   Bookmark this reply Add gerio2 to your friends list Get a Link to this Reply
Yes, I'm going to be very cautious. I was just hoping I might get a bit more definition of the horse's legs. But I'm not going to push it.
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