I have an 1851 3 cent piece has a blob of what looks like JBweld on the reverse was wondering if some one could help on how to get it off
Sell it and buy a new one. If you don't want to do that, you could try acetone. I'm not sure what jbweld is made of, but acetone might be able to help.
Here is the MSDS on it : http://s7d9.scene7.com/is/content/GenuinePartsCompany/2118182pdf?$PDF$ A photo might help to determine if it was JD, or old silver solder which can 'tone' as it ages also, and commonly used in jewelry to make such as buttons and pins from coins. Jim
The only way I know of to remove JB Weld is to torch it off with oxy / acetylene. Sorry, not much help to you, as I do not suggest trying this on a coin.
Oof, that coin is rough. It is clearly ex-jewelry, as you can see from the notches in the rim. The coin is also pretty scratched up. Honestly, this thing isn't worth the effort. Even if you could get whatever that is off, the coin is damaged beyond hope.
JB Weld is epoxy. Hardened epoxies can be softened, dissolved and removed by a variety of halogenated solvents. A popular product for this is Attack, which is a brand of dichloromethane. However, as others have said, even if all the epoxy (if that's what it is) is removed, you'll be left with a damaged, low-value coin. Cal
JB weld? Nothing that I know of. That stuff is great but you can't remove it off of metal. It's a permanent bond.
Since it is an epoxy, you MIGHT be able to pop it off with sudden extreme temperature change. You are counting on a difference in the coefficient of expansion with temperature. What you need is an EXTREME tempearture change and it has to happen FAST. My favorite is to heat to a hundred degrees or more and then drop in liquid nitrogen.
