Hazy Proof Coins?

Acetone would not help. The coloration is oxidation and not foreign material or oil.

I bet if you wanted to sell that quarter, that last picture would net you a big premium from a toner fan.

Huh... That's interesting, I didn't expect that to work at all. Maybe plasticizers or something are out-gassing from the packaging and settling on the coins. I might try this on some hazy proofs I've got lying around.

I'm not gonna touch the quarter. I like it.

I am surprised as well. Interesting. I would not have taken the risk.

acetone will not remove toning but it can remove the haziness that is caused by the material the proof set housings are made of. It will not harm the coins surface at all like ezzest or other dipping chemicals do where they remove part of the metal and can cause the coin to look lifeless because of taking away material. Just be sure you rinse the acetone off well and pat dry if you must only, never rub a proof coin because their fields are very easily scratched

If the acetone is pure, it will always completely evaporate in seconds.

It is advisable to do a second rinse in fresh acetone. This will ensure that whatever was dissolved by the first rinse of acetone will not redeposit onto the coin.

As said, no need to rinse acetone. Though I have to add my surprise that it removed any of the haze. Tried it many times and got no results. I would also add that a quick dip in Ez est would be fine to remove the haze. IMO/E you would have to leave a coin in the dip for well into the minutes for it to kill a coin as mentioned. I have done it with circulated proofs and even after a solid minute there was no noticable difference from before the dip.

These are all coins from the 60's and 70's. Do you think it would be worth it to send to NCS? I don't expect any to be high grade coins and would only have them conserve them for me. I just want my coins to look nice in my collection is all. The price really doesn't look too bad for the work, but they are all rather common coins.

I used acetone on almost all of my proof coins today with great success for the most part, but the unc's I have out of the mint sets are another thing all together. I am letting them soak over night in acetone to see if that helps. If not then it is either NCS or replace them. Most of them.