Coinsandcanada.com

Hey guys
I have another one for you that I found and this one in a roll and I'm thinkn it's jus erosion I'm not sure but if you could be so kind and tell me what you're thoughts are that would be great ..
Thanks again .

That is called zinc rot, very common on copper plated zinc coins.
Eventually the coin will just rot away.

Thank you for your help I see now and I now know what to look for in the future..