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1996 D 10c Improperly Annealed?

 
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Pillar of the Community
United States
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 Posted 04/18/2021  2:26 pm Show Profile   Bookmark this topic Add CoinHI to your friends list Get a Link to this Message

Ok, after reading through past topics I understand this gets into the weeds quickly. Going through pocket change I have found two 1996 D 10c coins that look in the same grade except for the tone. I don't believe the darker coin is a "buried" or damaged specimen so I wonder if this is an annealment issue. Same lighting was used on both coins.









Best Find - 1976 D WQ DDO-001 http://www.coincommunity.com/forum/...IC_ID=382777
Interesting find - 1947 S over inverted S http://www.coincommunity.com/forum/...IC_ID=368005
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 Posted 04/18/2021  2:42 pm  Show Profile   Bookmark this reply Add Chase007 to your friends list Get a Link to this Reply
It doesn't look like one. A sintered coin will have no reflective field.
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 Posted 04/18/2021  5:25 pm  Show Profile   Bookmark this reply Add merclover to your friends list Get a Link to this Reply
Environmental tarnishing/staining/discolouration. These show up quite frequently, just PMD.
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50789 Posts
 Posted 04/18/2021  9:01 pm  Show Profile   Bookmark this reply Add coop to your friends list Get a Link to this Reply


Note the color differences, not being shiny?



Note even in the fresh open roll they were noticed:


These are so often faked, unless you open an original roll, they will probably be altered coins, like the one above.

CoopHome: What do real black beauties look like?

Richard S. Cooper
Some have asked about my images I use and I'm glad to say, you can now you can see the DVD in sections on youtube:
1. Intro, older coins, toned coins 2. Doubled dies 3. Die events, One of a kind errors 4. So called errors, Coin information 5. Coin information Types and Varieties, Overlays
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Canada
736 Posts
 Posted 04/18/2021  10:10 pm  Show Profile   Bookmark this reply Add silviosi to your friends list Get a Link to this Reply

Quote:
Annealing is a heat treatment process used mostly to increase the ductility and reduce the hardness of a material. This change in hardness and ductility is a result of the reduction of dislocations in the crystal structure of the material being annealed.


Why the TPG quote "improper annealing" ?!!? Mystery. Maybe just a marketing tool.

Improper annealing at a strike of 60 to 90 tones in function of the coin metallic composition will normal crack the crystal structure.
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 Posted 04/19/2021  11:51 am  Show Profile   Bookmark this reply Add CoinHI to your friends list Get a Link to this Reply
Silviosi, What is your opinion on the coin in question? Thanks.
Best Find - 1976 D WQ DDO-001 http://www.coincommunity.com/forum/...IC_ID=382777
Interesting find - 1947 S over inverted S http://www.coincommunity.com/forum/...IC_ID=368005
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Canada
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 Posted 04/19/2021  5:39 pm  Show Profile   Bookmark this reply Add silviosi to your friends list Get a Link to this Reply
Coop give the right answer. Me I do not see a problem of annealing. I see one coin from 1996 with grease struck. The rest are great. The change in color or shinny? Yes is happened due to the age and environment, but do not degrade the coin. I hate those who say not anymore mint shinny. Ok maybe but you are same like 40 years ago? , no .

For more precision is: The annealing of the Nickels is done at 900 degrees. If it is improper annealing or faster cooling, the color is different. I will look for the color chart for nickel and post here.
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