1932 Washington quarter burn mark removal?

I had purchased a lot of 5 1932 Washington quarters and all look good except this one. It looks as if it was burned or something in those lines.. is there a safe way to remove these marks without damaging the coins or reduce the spots to make smaller?

Thank you in advance!

 

Log in or Sign up to hide this ad.

It looks like oxidised silver. Unless it's a scarce year - it might not even be worth doing anything... Give acetone bath a shot but I think it's unlikely to do much difference.

 

I found this online :
https://ourpastimes.com/clean-burnt-coins-8704490.html

 

Yea I wasn’t to sure about it being burned or oxidization.. I’ll try that when I get home!