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 Replies: 9 / Views: 2,355 |
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Pillar of the Community
United States
1247 Posts |
I have been cracking out proof sets, and on the 1980's US sets, I sometimes find some "fog" around the rims of the coins.
I have found that using a cotton swab dipped in acetone, and gently, gently, swabbing the coin, it removes the "fog" and leaves no trace when it evaporates.
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Moderator
 United States
23522 Posts |
That's somewhat disturbing. Acetone can only remove organic contaminants, and I'm not expecting the Mint to ship containated product. There must be some exposure happening postmint.
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Pillar of the Community
United States
1476 Posts |
Well that 'fog' is even on some of the recent coins I have received from the mint this year.
I was wondering what that was all about myself.
The latest one is an issue with the New Marshells Proof silver dollar. Same 'fog' going on there.
Can anything help?
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Pillar of the Community
 United States
1247 Posts |
I use acetone.
Acetone will also remove oil and oil based products.
The 'fog' could be off-gassing from the plastic. Or perhaps, simple humidity with some contaminants.
All I can say is that for the dozen or so coins I have done this to today, it works perfectly.
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Bedrock of the Community
United States
20753 Posts |
I've found that fog on coins too. Same thing with Acetone and it's gone.
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Pillar of the Community
United States
604 Posts |
Is it the acetone removing the fog or the abrasion from the cotton? I'm wondering if the acetone is doing any more than acting as a lubricant.
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Moderator
United States
187862 Posts |
The OGP is not air tight, so something like this ocurring post mint can and does happen.
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Pillar of the Community
United States
604 Posts |
 I have seen many proof sets new and old with this haze/fog. I have read that it may be happening because of something during the rinse process at the mint. I can't say for certain if that is the reason or not. It could just be as simple as it wasn't properly stored  |
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Moderator
United States
23522 Posts |
Well, there are enough different people suffering similar symptoms here to move one's thinking to a common cause; we all live in differing atmospheres. So the Mint looks more like the culprit; my snap guess is something which is occasionally incompletely rinsed from the planchets. Soap scum, so to speak. Acetone would remove it.
Can't say I'm really a fan of MS70. It's relatively benign - essentially soap and water - but it really doesn't generate results not duplicable with less invasive liquids.
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Pillar of the Community
United States
1476 Posts |
I tend to think it is something from the mint as well. MOST of the silver proofs I have bought in the last 10 months will have some kind of 'fog' on them. I do take into consideration that I live in Florida as well. So I make sure I let the packages acclimate to room temp prior to opening them. Then they are inspected and stored with dessicant in zips until I want to love on them again.  I will break out a bullion round and give the acetone a try and then try a proof if it works out. |
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Replies: 9 / Views: 2,355 |
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Posted 03/07/2015 7:26 pm
