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 Replies: 11 / Views: 3,408 |
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Pillar of the Community
1110 Posts |
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Pillar of the Community
United States
1959 Posts |
I'm lazy and go the the local coin shop and buy the America the Beautiful Quarters. They have them in mint rolls. As I pick through the rolls to get the best examples I have noticed A LOT of coins coming straight from the mint with these stains. That's why I search them and find examples without them. I always assumed they were a residue from some sort of rinsing process that isn't fully removed. I virtually never saw this on S mint coins. The worst was Philadelphia. I'm surprised West Point coins have this residue on them. That's a real bummer to find them in the roll like that. I would have thought West Point would have better quality control than that since they aren't producing billions an billions of coins per year. I've always assumed it was some sort of mineral deposit. Kinda like spots on your car after it was washed and rinsed with hard water. These are all assumptions on my part so anyone feel free to correct me. If they are soapy/hard water spots, acetone will not remove them. They will most likely be made primarily of calcium carbonate. In the industry I work, calcium deposits are removed by acids and are not affected by solvents. Of course, you wouldn't want to put harsh acid on them, but I'm wandering if you may be able to experiment with vinegar (acetic acid) on a coin you care nothing about with similar spots to see what kind of results can be obtained. Anyway, I know vinegar is a big no no, but maybe a quick dip and thorough rinse will remove the stain. Just my thoughts. Good luck! |
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Pillar of the Community
 1110 Posts |
jpbone-
Thanks for the reality check. Your explanation of some type of dried residue from a rinsing process sounds very plausible. That's pretty much what it looks like.
I might try diluting a little vinegar. Thanks very much!
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Moderator
 United States
188770 Posts |
Yuck.  A good reason to wish they had offered these as a direct sale from Mint. At least the chance for better quality exists. |
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Pillar of the Community
United States
811 Posts |
all the w,s I have found dont have those stains.but ive just found 20 so far
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Pillar of the Community
1110 Posts |
Quote:
all the w,s I have found dont have those stains.but ive just found 20 so far Were the W's 2020's? |
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Pillar of the Community
United States
811 Posts |
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Pillar of the Community
1110 Posts |
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yes marsh-billings w.s Can you post a picture of it here? |
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Pillar of the Community
United States
4680 Posts |
I pulled 11 out of a box last week, I think only one had a spot on it. The issue I noticed on mine was a small nic on the rim that affected one of the reeds, about half of them had it. Link for pics. http://goccf.com/t/384905No close ups of the rim though. |
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Pillar of the Community
1110 Posts |
Ty- Thanks for that link!
Unless I hear from others, I'm wondering if mine are an anomaly. And where the heck did these stains come from? : (
BTW jpbone, no joy with the vinegar.
Edited by MOS0239
11/01/2020 6:02 pm
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Valued Member
United States
455 Posts |
There was an article, on the spots on ASE, and it was soap not rinsed completely after the cleaning process. Webekin |
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Pillar of the Community
1110 Posts |
Soap? Well, it's baked into the surface now!! : (
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Replies: 11 / Views: 3,408 |
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Posted 10/29/2020 8:48 pm
