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 Replies: 17 / Views: 7,799 |
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Pillar of the Community
United States
556 Posts |
I found this roll hunting, and I want to know if this is a genuine unplated cent or if it has been altered in some way.   |
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Pillar of the Community
United States
2189 Posts |
Metal detector find.Environmental damage.It spent some time out in the weather.About the only way to confirm an unplated Lincoln is if the Original mint luster is still present
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Pillar of the Community
 United States
2448 Posts |
I'm curious, actually slept through most of my Chemistry classes, but what chemical reacts with copper and not zinc? In other words, how do you de-plate a "Zincoln"?
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Pillar of the Community
Canada
1411 Posts |
There is a chemical that does if I remember correctly.
So a little dip would strip the copper.
Edit:
There is for Copper (I) as it has a different ion charge than Zinc.
Copper (I) is not the most common form of copper, but is the second most common form of copper.
Charges being
Copper (I) with 1+
Copper (II) with 2+
Zinc with 2+
Therefore, a dip would remove the Copper if it is Copper (I), but not if it is Copper (II). This would mean that most would get partially deplated, a few would not be deplated and a few would be deplated fully.
Edited by Windchild
01/02/2013 11:08 am
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Pillar of the Community
United States
1812 Posts |
In my error dated edition of "Error World" (photo of error date on magazine to be posted in another thread this evening) mentions that a Lincoln Cent struck on a unplated planchet should weigh 2.17 grams... |
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Bedrock of the Community
United States
12437 Posts |
Quote:a Lincoln Cent struck on a unplated planchet should weigh 2.17 grams That is too low, there is only 2.5% copper content in a Zincoln. All of my zinc blanks and planchets weigh in the ~2.35-2.45 gram range. |
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Pillar of the Community
United States
3640 Posts |
Looks just like a circ. decent steely.
I do not see any copper remnants at all left.
Also possible to have an unplated cent with little or no
mint luster left. No definate yes or no on this one.
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Pillar of the Community
United States
1721 Posts |
I have dug hundreds of Zincolns and never found one that looked that good. They all have blisters, deep pitting or the coin is partially remaining. I never found one that was missing the copper. Mike Diamonds site shows one without any luster. Maybe Mr. Diamond can chime in on this one.
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Pillar of the Community
Canada
1411 Posts |
From the Chemistry side,
It is possible that the plating was completely Copper (I) but that would be 1 in a billion, if not more.
I would go with REAL!
That is my opinion, just based on the chemistry.
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Bedrock of the Community
United States
17884 Posts |
Copper(I) and Copper(II) are copper in its oxidized state. Metallic copper is neither (I) or (II) but can become either one.
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Pillar of the Community
United States
1812 Posts |
@biokemist6, I just posted the magazine cover with the error date above, and on page 10 is a photo of a NGC Certified 2002d 1 Cent Struck on Unplated Plan - 2.17GR MINT ERROR MS63 (slab #1653409-001). The article also mentions that this is the TRUE weight of a unplated cent... I can't post photos as all the photos are copyrighted and require permission to copy. This coin is on the magazine cover in my post and was owned by Rich Schemmer (well known error dealer) and sold on ebay in 2002 for $960.01 |
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Bedrock of the Community
United States
12437 Posts |
Edited by biokemist6
01/03/2013 5:22 pm
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Pillar of the Community
 United States
556 Posts |
If it helps at all, I just weighed the cent in the picture and it weighs 2.50 g.
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Pillar of the Community
United States
2448 Posts |
Ever the optimist, looks like to me, you may have an un-plated LMC. Nice! |
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Pillar of the Community
United States
2737 Posts |
It is impossible to establish authenticity from your photo alone. However, the very dull, ash-gray appearance suggests to me that it was de-plated outside the Mint.
Error coin writer and researcher.
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Pillar of the Community
United States
1812 Posts |
@biokemist6
I just checked out the 3 ha links above and can see the confusion here between both of us. After viewing the certified weights on your links I would agree with you that the 2.17 gram unplated cent could well be underweight for a Zinc planchet, and not noted as such on the slab.
Another quote from the 2002 Error World article on unplated cents below.
"1) Stick with coins that are certified by a major grading company, such as ANACS, NGC or PCGS. There are numerous fakes about that can fool even the experienced error collector."
"2) Zinc-plated cents can be easily detected by weighing your coin. True unplated errors will weightless. They will also exhibit flow lines from being struck and will have mint luster."
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Mike Diamond,
As I was sorting through the different magazines, I had come accross your article in the "Error Scope" Vol 12 No 2 March/April 2003 edition on "Invisible Strikes: A Closer Look" and have some coins that may or may not fall in that catagory. I have always questioned in the back of my mind how some of these coins can have the faint (and sometimes no) details on the in collar indent strikes.
I hope to post a few threads sometime this evening on CCF and will title this one "Invisible Strikes?!?" and hope to gain more knowledge on weak indents.
Maybe if you have the time to respond, you can educate others as well.
Thanks in advance.
Edited by Broken-Coin
01/05/2013 11:26 am
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Replies: 17 / Views: 7,799 |
Posted 01/02/2013 07:04 am
