I've identified 40-50 coin so far. Now I'm working on the more difficult coins. The attachment is a collection of coins that appear to have been laying on each other and caused build-up that is raised to the touch. I've also read threads here and it seems the most popular solution is Acetone. Help?
Acetone isn't likely to help very much. They all look like they've corroded enough to have surface damage but you can try soaking them for awhile it certainly wouldn't hurt.
The first thing I would try with these would be a prolonged water soak. Soak the copper coins together and the Cu-Ni together. Give it a couple of days and brush with an old toothbrush.
Always start w/DISTILLED WATER-in a( hand held steamer if available) and then a soak in acetone afterwards,these may be damaged by corrosion which looks to be salts of some type? Best of luck!
Not convinced for most circulated coins...Proofs and MS- state coins yes, not circulated coins. Tap water in most areas is no more than 500 ppm dissolved solids, that translates out to 99.95% pure water. However, I might hold on the toothbrush, and just rinse/soak them first and then pat dry with a soft towel (even 0.05% adds up).
Thanks for all the advice! I had them in WD-40... Because it was on-hand... Nothing. So... Now onto you-alls suggestions!
Thanks for the included information! A quick update... I did the soak-in-Coke thing. Surprisingly the Coke removed the raised-gunk. Stay tuned!
I would imagine it would remove a number of elements including the patina .. the part which most collectors like
