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Soaking dug ancient coins in olive oil to clean - Wow! But how long?

aaron7

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Townsend, MA
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Garrett Ace 250
Received a mixed lot of "dug" ancient coins as a gift and have had them soaking in olive oil for two months now.

Wow, what a difference! A ton of the hardened material has dissolved off and the bag is now full of dirt.

I think it has run its course, but wondering how long should you let them sit? How long is too long?
 

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