I have read quite a bit about soaking a coin in olive oil. Seems people get mixed results from it. One thing is olive is a tad bit acidic and can your copper pink. Did yours turn pink at all?
No it stayed nice deep brown, as I said I collect only G/VG which this was. I would not do it to a high grade copper, but then again a high grade copper shouldn't have the vertigris to start with I would hope.
I wouldn't do anything to it, but leave it like it is. Cleaning can be detrimental and render the coin virtually worthless. It should show up pretty well in your collage, or perhaps you should choose a brighter coin for it.
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