Cleaning copper coin?

[Hunter101]

So I had just found this penny from Great Britain.



The picture shows the coin after being cleaned with soap and water. I've heard you can take a toothpick and get some of that dirt off. Does that work? What are some other methods?

 

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[tony curnick]

Try soaking it in synthetic motor oil using an old tooth brush to release the dirt,it can take a few days but will mot affect the green patina on the coin

 

[Tom_in_CA]

ammonia

 

[Icewing]

I use mineral oil