Well I received the quarter sized cookie coin from Rob and went to work on it last night. I used electrolysis with 7.5 volts and 150 ma. I gave it two 10 minute runs with the water changed out in between. The last run was 15 minutes and the crust became soft on the surface. I then brushed it under running water with a nylon brush and all of the soft crust came off. There was now a thin layer left on the coin and I use some small bamboo skewers to pick the remaining crust off. The coin lost some of it's rim and the reverse had the lower portion flake away with the crusty coating. I think it turned out well considering the crud it had on it. It is now soaking in ammonia. The first pic are the two prizes next to a quarter for size. The next one is the cookie coin after chipping off the crust, the last is the coin after a light brushing before going into the ammonia. Thanks for the chance to play with another cookie coin Rob!! I really enjoy it. It's an 1898 to boot!
The ammonia will help remove some of the left overs on the coin. It is really great at getting stains off silver. It also won't damage the silver which is good.
That crust was from 100 years in salt water! See Robs posts about the Shark Pit and the cookie coins that he finds there. You can see how they look when he finds them from my first pic above. Rob sent me this one along with the sharks tooth and a hat for winning his contest. It really is an experience getting that shell off of the coin.
Minelab SD2100/Explorer XS/ Garrett GTI-1500/GTA-1000/Grand Master Hunyer III/White Goldmaster II
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Re: Cookie Coin cleaning
Hay Rich have you tried brown vinegar and salt, and let soak for a day then brush then soak some more. I had a chine coin that was burned up badly, and I soak it for a few days and it clean it up.
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You did a good job with this coin! Glad you had fun with it and shared it with us all!
