Ask a question or post your most recent discovery.
- Posts: 11494
- Joined: Wed Jan 28, 2009 4:59 pm
- Location: Ohio
I agree, a planchet bubble burst or there was a plating disturbance that caused teh zinc to be exposed and to react with the environment.
- Forum Supporter
- Posts: 1214
- Joined: Sat Sep 21, 2013 6:08 pm
Sometimes this shows up in the form of a rupture or "volcano". Yours happened to occur under the Denver MM.
Who is online
Users browsing this forum: woloff and 27 guests