How to remove green spotting on a coin

Is there a safe way to remove stuff like this green that gets on some older coins? Acetone? Any help would be appreciated.

 

Log in or Sign up to hide this ad.

Looks like it might be on there forever,pictures of the whole coin would help.

 

Once the Patina starts there's no stopping it . It's an entity , I tell you !

 

I think so. It's on a few of the Thai coins I have. It's unfortunate. Just hoping there was a way to get rid of it.

 

I would take a Q-Tip with some acetone or distilled water and dab it gently.