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 Replies: 19 / Views: 1,651 |
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Valued Member
 United States
71 Posts |
the center of the coins in this case the bust of washington is unaffected by it but its everywhere else on the coin.
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Valued Member
 United States
449 Posts |
Hard to tell from photos, but white haze around the edges of proof coins is pretty common and probably formed in the original proof set. However fingerprints and the other marks I see on some of them is obviously from having been removed from the OGP and handled and now are impaired proofs.
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Moderator
 United States
97208 Posts |
The fingerprints are an important diagnostic tool - it tells us that the coin were mishandled
Improper storage can cause this 'milk' stains on them.
Edited by Dearborn
05/13/2023 11:33 am
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Valued Member
United States
71 Posts |
the finger prints didn't deposit all white crap on them. I have others that don't have finger prints o them but they have the crap. need a way to remove it with minimal damage to the coin. any ideas? cuz they are worthless like they are.
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Moderator
United States
97208 Posts |
I'm not say that the fingerprints are the cause of the milking issue. They only help tell the story of how they were handled in the past.
Usually when the milk spots show up, there is not much you can do about it.
Try an acetone soak and see what happens.
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Bedrock of the Community
United States
19201 Posts |
I've seen similar in late 60s/early 70s proof coins in 'unopened' packaging. The packaging isn't always 100% air tight. I had a '71 set which appeared to have been in a high humidity/high temperature environment for some time. The coins were cloudy and a couple had a 'bullseye' discoloration pattern.
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Valued Member
United States
71 Posts |
Coin dealer called them milk spots. a little muratic acid and anti-tarnish gold and silver polishing cloth. They are shining again. All is well. Finger prints are gone too.
Edited by coincrew1000
05/13/2023 8:56 pm
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Moderator
United States
97208 Posts |
good to hear - can we see some after pictures?
I have not heard of this procedure before, can you explain it please? I would like to try in myself.
Edited by Dearborn
05/13/2023 9:08 pm
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Valued Member
United States
71 Posts |
take muratic acid 1 part acid one part water. 50/50 dip cotton swab in it rub the dirt or whatever is on the coin. usually comes right off. then use the jewerly polishing cloth.   |
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Moderator
United States
97208 Posts |
Thanks Crew. Your proofs look a lot better.
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Pillar of the Community
United States
3207 Posts |
it may look better in a photo, but any kind of rubbing scratches the surface, which lowers the grade and the value
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Pillar of the Community
United States
2365 Posts |
Milk spot origins: Quote:
The blanks are heated and cooled (a process called annealing) to stop the silver becoming too brittle. But the fatal process happens before annealing when it's being cleaned and degreased with solvents. Sometimes not all of the solvents are removed before the blank's heated, sneakily imprinting imperfections into the silver. The newly minted coin may look perfect, but the leftover solvent goes undetected and, as time passes, starts to show. |
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Valued Member
United States
425 Posts |
Definitely improper storage of the coins. Humidity will fog up the coins as well as not sealed properly. Must have a dehumidifier on in the room where your coins are stored. Just set it and forget it. one to one and a half years will fog them up. If you soak them to remove fogging do not touch with any cloth. Especially a proof coin because it will put hairline scratches on coin. I guess it you are not selling the coin and saving it would be o.k. Boy when I sent coins to ANACS there conservation on a coin took all the milk spots and fogging off. They used to only have one charge for conserving all the coins. Do not know if they changed that.Good luck anyway on what you do. We always want to keep our coins safe. You can always throw dry lock packets in with the coins you save. This helps too.
Edited by SaturnD51
05/14/2023 10:03 pm
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Valued Member
United States
71 Posts |
not grading them. they just need to look good.
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Moderator
United States
189311 Posts |
It may not be perfect, but still looks better than it did.  |
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Replies: 19 / Views: 1,651 |
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First Page
Posted 05/13/2023 11:18 am
