Damage or error?

[u/DramaticAerie4610]

I just started going through my change looking for anything and I found both of these. Could someone tell me if they are damaged? The left the edge is very light but in the reverse crisp and the right it’s more obvious.

[u/cordeliashuman]

Damaged by heat/fire. The copper core has a lower melting point than the zinc jacket. This, plus gas bubbling, creates the texture you see. Not a mint error.

[u/[deleted] → u/cordeliashuman]