Discussion in 'Coin Chat' started by cplradar, Apr 11, 2021.
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I only did it once, and it stayed nice for years but I finally sold it.
Next, an acetone bath, no rubbing.
MS70 might even work.
I'm guessing that neither you nor the buyer looked at it under light from the right angle after the eraser treatment. It's hard for me to imagine rubbing a proof coin's mirrored surface with an eraser and not leaving hairlines -- even an eraser that doesn't have an abrasive as part of its formulation.
Funny you should mention that, I did look at it under a Dinolight & my loop at many angles and it looked fine. I wish I still had the images but I did delete them.
Like I said don't try it at home.
I am not using an eraser on it but OTOH this coin is not proof
They do exactly that. All washing takes place well before striking.
that spot came from before the actual minting?
The guy at a jewelry store down the street from me cleans coins with the same steam blaster he uses for cleaning diamond rings.
that doesn't damage them?
If I had to guess, I'd say that someone sneezed or coughed on it between the time it was struck and the time it was wrapped.
Clearly though, the first step is an acetone bath. In fact, that might benifit most of my coins. (that is a question not an answer). I can't really hurt them even leaving them in a bath fo hours.
I think I'd try distilled water before trying acetone, but acetone first won't hurt. You're right that it's harmless. (Don't leave them in bright light while they're soaking, though; there's a remote possibility of light-catalyzed reactions that can change the color of copper.)
If the spot's been there for a long time, though, it's likely that some toning has happened, either under the spot or everywhere-but-under the spot. That's harder to fix, and requires a chemical approach.
It's steam. What could it do?
I've since done it lots of times with coins for the "Coin Club"s at the schools I work. Now of course the coins I'm cleaning were never ever gonna be worth anything more than face value anyway unless the get scarce for some odd reason. They don't show for anything done to them except for looking clean of any garbage that may have been on them.
cplradar "that doesn't damage them?"
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