Ok thanks. Good info. The coins will not be sold anyway. I'm keeping everything for my daughter. Just wondering if it would be worth grading and sealing for the future. Cheers.
i find olive oil may darken the patina. one method I have used to clean metal detecting finds is put a small cup of peroxide in the microwave for a minute then drop item in,,,it will fizz for hours lifting the dirt
The only time you have to worry about acetone discolouring the coin is when you're soaking copper that is still red. It might give the coin a purplish tone. But I won't worry about other coins.
I have no experience with olive oil myself, but as far as I know it has an acidic pH and it is insoluble in acetone, so it might be difficult to get off. I've never used peroxide either.
You can clean the coins as advised above, but they are not worth the expense of grading. If you want to seal them, get ahold of some appropriate size Coin World Premier Holders, and you can 'slab' them yourself. The Avery 8195 label is just the right size for a nice, custom label.
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