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- Feb 6, 2018
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Goldpick said:No, I don't have much luck either using the foil method, in fact it has ruined a couple of my .925 coins. I used to have more luck using electrolysis, though don't bother cleaning the .925 ones these days. Citric acid does work very well on the 50% silvers.
Totally agree, the foil+bicarb method is brutal on our coins, maybe moreso than what the main sentiment on the internet suggests. On coins that I really want to look after, I take off the horn silver by rubbing it in my fingers with a paste of bicarb. Takes absolutely ages sometimes but it's about the only thing that I've found will wear off the crust and leave the silver in decent condition. I get a toothpick with some paste on it to get into lettering etc. If I get impatient sometimes I end up giving it a gentle rub with foil but half the time I end up creating a layer of silver on top of the crust - sure it hides it but it also hides all the detail! Sometimes you can flake it off but it's never pretty afterwards.