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Roman and Armenian coins

I have a friend who brought me back some ancient coins from overseas and I dont know anything about them. Is there anything I should do to preserve them? anything will help, thanks.

Donavan
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Comments
Letting them soak in olive oil for a few months will gently loosen some of the encrusted soil/sediments. Every few weeks you can put them in new olive oil and check the progress.
Acetone dips can be used to remove the oil