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Milk Spots On Graded Coins

 
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 Posted 01/31/2020  6:46 pm Show Profile   Bookmark this topic Add coin searching to your friends list Get a Link to this Message
Hi everyone. I am new to coin collecting and to this community. I bought a few graded silver coins with milk spots on them. From my online search, they are unavoidable and the spots can develop over time and after they were graded. Are the grades meaningless after the coins inside the slabs develop the spots or do they still hold the same grades?

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 Posted 01/31/2020  9:43 pm  Show Profile   Bookmark this reply Add CoinCollector2012 to your friends list Get a Link to this Reply
The grade on the coin is still most likely accurate, but milk spots hurt the eye appeal of the coin and will trade at a discount to what the price guides say. Can we see some pics of the coin in question?
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 Posted 01/31/2020  10:26 pm  Show Profile   Bookmark this reply Add Dorado to your friends list Get a Link to this Reply
To the Forum.

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 Posted 02/01/2020  4:46 pm  Show Profile   Bookmark this reply Add just carl to your friends list Get a Link to this Reply

Milk spots make the value drop.
just carl
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 Posted 02/01/2020  8:10 pm  Show Profile   Bookmark this reply Add Ballyhoo to your friends list Get a Link to this Reply
Welcome to the forum. Great question. While photos would aid in a more accurate response, what you've described is somewhat common. To explain this, assuming you are referencing modern coins from around the 60s and 70s, mint set coins from this time period developed those spots due to poor mint issued packaging. As stated, the condition most likely did not exist prior to grading. However, they will still assign a grade if it exists only perhaps lowering it from one otherwise in pristine condition. I had a 1964 Kennedy half with those same blotchy white patches in NGC PF64 which I sold for an upgrade.
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 Posted 02/01/2020  9:21 pm  Show Profile   Bookmark this reply Add mikem007 to your friends list Get a Link to this Reply
Wow. I sent 20 coins out for grading last February and when they came back, 4 had the white patchy "milk spots" inside the slab. I assumed it was due to the fact that my coin shipment probably came from sunny warm California and likely froze in the mail as it was 20 degrees here in NJ. I have a batch of 8 coins going out to PCGS but I'm waiting for non-freezing temps. The temperature change reason I'm giving is just a guess by me on how that happened.
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 Posted 02/02/2020  09:52 am  Show Profile   Bookmark this reply Add basebal21 to your friends list Get a Link to this Reply

Quote:
To explain this, assuming you are referencing modern coins from around the 60s and 70s, mint set coins from this time period developed those spots due to poor mint issued packaging.


Packaging has nothing to do with milk spots and they've been a problem them entire time but are actually a more modern problem than the 60/70s. Packing haze can be removed milk spots cannot. Milk spots are a result of something in the manufacture process and are believed to be a result of what happens during the rinsing process
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 Posted 02/02/2020  5:52 pm  Show Profile   Bookmark this reply Add coin searching to your friends list Get a Link to this Reply



Here is a pic of the milk spots. Not to big, they are there.
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 Posted 04/11/2020  02:33 am  Show Profile   Bookmark this reply Add Paradime Coins to your friends list Get a Link to this Reply
This happens all the time to modern coins especially silver eagles. If you youtube taking away milk spots on silver eagle you will find a variety of option which mostly include dipping, which should get the job done right
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 Posted 04/11/2020  07:10 am  Show Profile   Bookmark this reply Add BadDog to your friends list Get a Link to this Reply

Quote:
If you youtube taking away milk spots on silver eagle you will find a variety of option which mostly include dipping, which should get the job done right

I've never tried this, so can't personally say whether any YouTube methods work or not, but here's what NGC has to say about milk spots

Quote:
Numismatic Conservation Services (NCS), an independent affiliate of NGC, has conducted extensive research but has been unable to determine a conservation technique that can prevent or remove white spots without damaging the coin. In some cases white spots can be minimized, but they cannot be removed.

If you try any YouTube methods yourself, I believe it's always wise to first try on a low value coin, just in case the technique doesn't give the results you hope for.
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 Posted 04/15/2020  4:43 pm  Show Profile   Bookmark this reply Add Big-Kingdom to your friends list Get a Link to this Reply
my understanding is some coins have a bit of residue left over from the rinse process, and that residue is hammered into the coin at high pressure with the strike of the coin.

You won't see it immediately because it's been mashed into the metal, but the area will turn to white in time, sometime quick sometimes slow, but the problem is there and because is smashed into the coin, it can't be removed without damaging the coin. like it says you can lighten it's visibility, you can make it disappear for a while mostly, but it's going to come back. unless you remove the affected metal which will damage the coin.

personally, I try to avoid buying silver eagles unless it's near spot price for silver and reasonable, for this reason. You are gambling on the milk spot developing, andf best not to overpay for it, you can always send it for grading yourself if it stands the test of time.
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 Posted 04/26/2020  06:20 am  Show Profile   Bookmark this reply Add TheInfinityPoint to your friends list Get a Link to this Reply
From what I've read a lot of milk spots on the coin would affect the grade if you submitted them like that for grading. Unfortunately if you were to resell it it most likely wouldn't fetch the same price as an equivalent PF70. Apparently even the US Mint and NCS (the experts in coin conservation) do not know what causes it or how to remove them.
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