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Anyone Familiar With The Cause Of This Phenomena? Zinc LMC's Only

 
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Author Previous TopicReplies: 7 / Views: 304Next Topic  
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 Posted 03/07/2021  6:05 pm Show Profile   Bookmark this topic Add HGK3 to your friends list Get a Link to this Message
I'm sure this has been addressed before, but I don't what to call it so can't effectively search for it.

Acquired a batch of LMC's recently and noted this on the obverse and reverse of various 1980's zinc plated LMC's, some more than others, but only on the zinc ones.

It has an initial appearance of mold, but can't be removed (and copper is an effective fungicide, so that's out). It doesn't appear to be due to buffing or any other mechanical action.

It always seems to start in the center of the coin.

It is darker in the photos and in hand appears more of a lighter, silvery gray color.

I've seen it occasionally in the past, but this batch of cents has it frequently.

2 examples from the batch below.

Any thoughts?





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 Posted 03/07/2021  6:07 pm  Show Profile   Bookmark this reply Add coop to your friends list Get a Link to this Reply
I always figured this to be burn marks on the cents with a cigarette lighter. Not a plus for the coin, but just a spender. Keep the best, spend the rest. It wasn't there when the coin was struck.
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
Jefferson nickel doubled dies Wexler/Rebar complete listings

trail dies:http://www.traildies.com/
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 Posted 03/07/2021  7:23 pm  Show Profile   Bookmark this reply Add Coinfrog to your friends list Get a Link to this Reply
Agree, burn marks. As if the Zincolns don't have enough problems already.
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 Posted 03/07/2021  7:51 pm  Show Profile   Bookmark this reply Add td5173 to your friends list Get a Link to this Reply
@coinfrog
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 Posted 03/07/2021  8:21 pm  Show Profile   Bookmark this reply Add Coinfrog to your friends list Get a Link to this Reply
Just think - the nasty, unstable, hateful Zincolns have been around almost 40 years now, basically the same span as the beloved wheat-backs of 1909-1958. They are pumped out by the billions with apparently little effort at quality control, and they are notorious for deteriorating over time even left alone in a stable environment. And yet - they're collected avidly.
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 Posted 03/07/2021  10:28 pm  Show Profile   Bookmark this reply Add macmercury to your friends list Get a Link to this Reply
Now try and figure what is the brand of that lighter that leave that kind of burn marks.

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 Posted 03/08/2021  7:14 pm  Show Profile   Bookmark this reply Add HGK3 to your friends list Get a Link to this Reply
Well, I appreciate the input, but I remain skeptical of the burn/lighter theory.

As I said, the pictures came out darker than in hand. Overall, the color is closer to silver/gray than what appears.

The marks aren't soot, as they don't wipe or wash off.

It could be the copper plating blistering off due to heat, but here's a couple of close up which don't show any obvious blistering or heat related rippling.

Thanks for your time!



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 Posted 03/08/2021  7:26 pm  Show Profile   Bookmark this reply Add coop to your friends list Get a Link to this Reply
Note the last image, how the darkened area is not peeling off and still showing the plating. So something altered the outside edge plating. (Torched) PSD.
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
Jefferson nickel doubled dies Wexler/Rebar complete listings

trail dies:http://www.traildies.com/
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