My AT turned up a large copper planket today at a site that had a store on in in the 18th century. It is 1 1/16" in diameter and 1/16 " in thickness. I can see some relief on it but it has alot of green on it. Should I clean this coin to try and ID it or let it be? I thought a hot hydrogen -peroxide bath might help. Any opinions would be appreciated.
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Large copper planket???
- Thread starter Grunter
- Start date
Ive found that a soaking in olive oil will soften the crud over time. I've done this with some nasty indian head cents and it's worked pretty well most of the time. I let them soak for a couple of weeks and then lightly pick the crud off with a tooth pick. Keep repeating the process until you get the coin the best you think it can be.
Good Hunting,
ArtWI
Good Hunting,
ArtWI
William-NM
New member
I can't see it.... 
TerraDigger
New member
I would not do the peroxide. Do a organic oil soak with a clear oil that will not discolor object. Some olive oils will discolor metal due to the compounds in the oil.