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Has anyone ever encountered rust stains on silver coins? (Barber Half Dollar)

 
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Pillar of the Community
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 Posted 06/20/2018  6:49 pm Show Profile   Bookmark this topic Add thecoinguy1964 to your friends list Get a Link to this Message
*** Edited by Staff to Add Year / Mintmark / Denomination to Title. Titles are Important! ***

I bought a Ziploc of Barber halves about 4 years back, here in the Houston area, which is prone to flooding of course, but many of the coins appear to have a "rust like substance". This is not the first time I've encountered this in the Houston are. I've never used acetone, might acetone take out this "rust substance"? If pictures will help, I'll post some later.
Thanks in advance
"When a strong man, fully armed, guards his house, his possessions are safe."
- Luke 11:21
Edited by thecoinguy1964
06/20/2018 6:52 pm
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 Posted 06/20/2018  6:55 pm  Show Profile   Bookmark this reply Add Coinfrog to your friends list Get a Link to this Reply
Pics would help, but this would not technically be "rust". Oxidation or corrosion of some sort from an unknown environmental contaminant, but not rust.
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 Posted 06/20/2018  7:07 pm  Show Profile   Check BigSilver's eBay Listings Bookmark this reply Add BigSilver to your friends list Get a Link to this Reply
I have seen the phemonena that you refer to, but don't know what it is.
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 Posted 06/20/2018  7:50 pm  Show Profile   Bookmark this reply Add sel_69l to your friends list Get a Link to this Reply
I have even seen rust stains on a gold coin.
The explanation given is that the coin was buried in a steel box for several decades in damp organic soil. The box rusted severely in direct contact with the coin (half sovereign), and formed a complex auro ferro double salt, resulting in some minor corrosion. The presence of copper in the coin alloy would not have helped.
Edited by sel_69l
06/21/2018 03:14 am
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 Posted 06/20/2018  8:50 pm  Show Profile   Bookmark this reply Add MikeF to your friends list Get a Link to this Reply
I found something that looked like rust on some ben Franklin halves I purchased from a pawn shop in a Whitman album. I soaked them in acetone followed by a hot tap water soak and that got rid of it. Pictures are really needed here.
Hi, my name is MikeF and I'm a degenerate coin collector. I also like adventure, big trucks, long walks on the beach and the Kansas City Chiefs.
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 Posted 06/20/2018  10:35 pm  Show Profile   Check spruett001's eBay Listings Bookmark this reply Add spruett001 to your friends list Get a Link to this Reply
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 Posted 06/20/2018  11:12 pm  Show Profile   Bookmark this reply Add Slider23 to your friends list Get a Link to this Reply
I had placed a silver dime, silver quarter, nickle, copper cent and a counterfeit trade dollar on top of my hot water heater in a envelope to see how they would tone. I had forgot about the coins for a couple of years until my hot water heater was leaking. The top of the hot water heater was covered in heavy rust water and the envelope had rotted away. All the coins had a coating of the rust on them. I used acetone on all the coins, but some of the coins had a stain after the rust sediment was removed. The coin that the rust would not come off was the counterfeit trade dollar.
Edited by Slider23
06/21/2018 12:02 pm
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 Posted 06/21/2018  07:40 am  Show Profile   Bookmark this reply Add thecoinguy1964 to your friends list Get a Link to this Reply
I had my suspicions that the coins had taken water while stored away in a metal box. I paid accordingly for the rust/oxidation stains, got them less than melt. They are not very desirable coins as far as eye appeal, but they're good enough for me. I'll get some pics up later. I will also try some acetone, never have gone that route before, but I've read about it on this forum for years. Thanks again!
"When a strong man, fully armed, guards his house, his possessions are safe."
- Luke 11:21
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 Posted 06/21/2018  07:43 am  Show Profile   Bookmark this reply Add T-BOP to your friends list Get a Link to this Reply
with coinfrog , silver does not rust. It's an environmental issue . Some stains can be removed from silver coins ,but keep in mind some can't . good luck with them .
Don't take life too seriously and remember it is just a passing fad ......
Michael Philip Jagger

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 Posted 06/21/2018  10:48 am  Show Profile   Bookmark this reply Add sel_69l to your friends list Get a Link to this Reply
That silver does not rust is true, but to get the idea of the effects of direct contact ground burial may have on an ancient silver coin, look at some of the lower valued examples of ancient silver coins, where wear has not been a major factor in it's degradation.
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 Posted 06/21/2018  12:30 pm  Show Profile   Bookmark this reply Add SilverDollar2017 to your friends list Get a Link to this Reply
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 Posted 06/21/2018  1:34 pm  Show Profile   Bookmark this reply Add just carl to your friends list Get a Link to this Reply
Rust is an ambiguous term. Basically used to describe Oxidation with Iron. However, rusting on any metal is basically combining with Oxygen and almost all metals will do that in some form or other. Such as Nitrates or Sulfates. With Silver, if in the area of any Chlorine or Fluorine and moisture, dark spots will be from those chemicals. And as anyone knows Silver does what is called Tarnishing.
another term for rusting.
If those spots are from any chemical reaction with the coins, removing such spots should also leave marks.
just carl
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 Posted 06/24/2018  3:20 pm  Show Profile   Bookmark this reply Add thecoinguy1964 to your friends list Get a Link to this Reply
I finally got around to taking a picture of the coins in question.
https://www.flickr.com/photos/16232...sted-public/
"When a strong man, fully armed, guards his house, his possessions are safe."
- Luke 11:21
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 Posted 06/24/2018  6:19 pm  Show Profile   Bookmark this reply Add two_tonevf35 to your friends list Get a Link to this Reply
Acetone won't hurt anything, but I don't know how much it will help.
PCGS submissions 2005-2018. Mailings(21) Orders(43) / 249 coin attempts. 12 Fails(5%) / Member vouchers(19%) Economy(62%) Regular(13%) Free(3%) Express(3%) / Barber 50c (46%) Classic Commemorative (38%) Hawaii(3%) SCD (6%) Other(3%)/ Fails: Cleaned(2) Alt surfaces(1) Scratch(1) Damage(1) "86"(3) 2 Columbian & 1 BTW; Min Grade(2) DNC(2)-Same coin NGC XF40 Barber 50c. Express fees paid by seller (cross guarantee). Kept the coin & later submitted raw: PCGS XF40 [eyeroll] Fails: Econ(8) Regular(2) Express(2)/// Other TPGs: ICG (2011-2018): 35/35 NGC: 0 ANACS: 0
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 Posted 06/24/2018  6:38 pm  Show Profile   Bookmark this reply Add Coinfrog to your friends list Get a Link to this Reply
Hey, how about some pics?
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 Posted 06/24/2018  9:51 pm  Show Profile   Bookmark this reply Add Namvet69 to your friends list Get a Link to this Reply
I'm going to say that brown stain might be leached out of the paper. Flood water soup is nasty, toxic liquid. Get those coins out of the folder. Acetone dip cannot hurt. Peace Roy
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