Questionable 1967 Quarter Error...

The Quarter on the right is the one with the "error"... any help in trying to figure this one out will be high appreciated. This is the first time I see something like this. I posted the only reference I have that may be a possibility of this type of error.

 

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Not an error, that's what happens when a coin is exposed to an acidic environment.

 

Not a Mint Error. It was altered outside of the Mint.

 

By treating it with acid.

 

Or sometimes just machine wear since the 100% copper core is much. much softer than the Copper-Nickel Cladding.

These coins have shown up here inthe past with the same questions being asked.

 

What acid would attack only the copper and not the nickel cladding? And then fold to edges over so that they are touching? I think it's better to admit you don't know than to just make up nonsense.

 

http://nvlpubs.nist.gov/nistpubs/scientificpapers/nbsscientificpaper435vol17p635_a2b.pdf

Just because you do not know does not make it "nonsense". Try to make, at least a half arsed attempt at finding the answer to your question before ostracizing another poster.

Regardless, the coin was altered outside the US Mint and way after striking.

 

Acetic reacts well with copper. It will also attack the coppernickel clad layer as well but not as strongly as the pure copper layer.

As to the folding over of the edges of the clad layers, if you dissolve back the copper layer so the clad layers are overhanging and unsupported, it doesn't take a lot of pressure to fold them down.

 

You've been around here for 9 years, so you should know better than to respond like this.

 

OMG...you're right, this is the valuable "licked Oreo cookie" coin!

 

Acid, huh? You mean like LSD? Actually LSD better explains the fascination with this stuff.

 

Dave, I don't know you at all. You could be the guy in the next office, and I wouldn't know. But I have to admit something to you, and I'm not especially proud of this, but your avatar leaves me with a visceral negative impression of you. I know that's silly, but there it is. I really hate that character on The Simpsons.

 

None of you know me, my education level or what professional experience I've had which allow me to form an opinion on whatever subject I'm commenting on. You might assume I don't know what I'm talking about, but consider the possibility that I just might.

Think what you want of me or of my opinions but when a snap judgement is made without any consideration of facts then I'll often call you out on it. In the past, coins have been shown here with battered edges and the instant remark is that it's a "Drier Coin", i.e., one that's been tumbled in a drier. That is complete and utter nonsense and I, in the past, challenged (without takers) anyone to deliberately recreate such a coin in a drier or tumbler.

In the case of the subject coin of this thread, the immediate comment was made that it's alteration was the result of being in "an acid environment." Further comment opines "acetic [acid?]". Wow!

All I can say at this point is that if anyone can duplicate what happened to that coin using any acid of their choosing, and provide before, during and after pictures, then I'll not only post an apology as my final post but I'll also never post any comment again.

Hate Nelson, dislike me - another snap judgement without any regard to facts. Either way, life goes on.

 

I bow to your superior knowledge, and only now realize that you are the ultimate king of the numismatic community. Your word is law. I shall forever be your loyal servant.

 

What do you think caused it??

 

Don't get all .... hurt. If someone challenged you in the way you tend to challenge things, you might get defensive also. No one wants you to quit posting, but if you would like me to duplicate the coin without you quitting, I might give it a try.

 

You do realize that a drier coin is usually something that takes a period time and does not always produce the same result so to challenge someone to reproduce it is kind of nonsense and does not negate the fact that a dryer coin is a dryer coin. The coin you posted is also pmd and most likley due to acid as far as reasons why people do it ive seen people when i was young tie a thin string to pull the coin back out of a soda machine.

 

http://www.totalmateria.com/Article16.htm

 

That link above that I just posted could give you a very good idea on what did attack the copper.

 

To respond to your snap judgement, I was able to find data on copper and 90Cu10Ni and the following common acids attack copper but not the copper nickel alloy; Carbonic Acid, <30%HCl at room temp, Phosphoric acid, and Sulfuric Acid at room temp. Adding nickel tends to increase corrosion resistance in alloys up to the point where it no longer forms a solid solution, so I would expect the 75Cu25Ni (75% copper 25% Nickel) found in the clad layer to be more resistant but I couldn't find any specific comparison.

I recall reading comments on CT that Kentucky has chemistry training and he has a track record of answering chemistry related questions. You are correct in saying that it's never a good idea to assume that someone doesn't know what they are talking about, but based on the comments posted and track record on this type of topic, I think I know whose opinion I trust and who needs to "admit that they don't know and quit making up nonsense".