Lots of environmental damage. Looks like they were in the ground before being found or stored where there was high humidity/moisture. Yes the green stuff is verdigris, if it's active, soft powdery, it could continue to eat at the coin and destroy it. You could use the search line here on CCF, type in something like how to clean copper/bronze coins, how to stop verdigris, you'll get topics and info about it. Some use lemon juice, olive oil, etc. I use a product called Verdicare to help preserve copper/bronze coins.
Check your other coins to see if they have any verdigris, consider storing your coins with less humidity, use desiccant products or a dehumidifier.
Check your other coins to see if they have any verdigris, consider storing your coins with less humidity, use desiccant products or a dehumidifier.
Edited by livingwater
01/20/2024 3:19 pm
01/20/2024 3:19 pm


















