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 Replies: 42 / Views: 4,949 |
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Valued Member
 Australia
236 Posts |
Hi enworb I agree a carbon streak is a planchet flaw once it disturbs the surface but I don't think it is considered a flaw if it is simply a streak of colour.
On that penny there are many carbon streaks but only one that intrudes into the surface. Perhaps this is a combination of a planchet peel with a carbon streak. But I'm only guessing really.
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Pillar of the Community
Australia
4411 Posts |
Id say the lamination is a result of the carbon streak being a weaker section if the planchet. I'll post my one a bit later today. Its very similar.
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Pillar of the Community
Australia
4411 Posts |
Edited by enworb
05/14/2013 9:29 pm
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Valued Member
Australia
236 Posts |
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Pillar of the Community
Australia
4411 Posts |
Youre the one with the coin in your hand :)
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Valued Member
Australia
236 Posts |
There is supportive evidence for both schools of thought though enworb. I have seen a lot of planchet flaws, peels, delaminations with no evidence of any carbon being involved, but I'm going to switch to your position in this case, as it is stronger.
The peel appears to coincide with the planchet streak (rather than the reverse) which is evidence for the peel being a 'result' of the carbon in the planchet.
I had erroneously thought that carbon streaks were from 'drag' over the top of a 'spot' of carbon in the extruding or polishing or whatever, process. I realize with a closer look that the carbon streak is the result of pockets or reefs of carbon being exposed at the surface. (with probably some drag too)
Hope that makes some sense.
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Pillar of the Community
Australia
4411 Posts |
Im not sure the black marks are actually carbon, I remember reading thats just what theyre called. Laninations can happen for a variety of reasons but all are different forms of planchet flaws, mainly impurities in the metal but also gas bubbles etc
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Valued Member
Australia
236 Posts |
If you find the article I would be interested to read it. Or any others. Thanks.
Very interested to see the photos of your coins.
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Pillar of the Community
Australia
674 Posts |
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Valued Member
Australia
236 Posts |
That's a nice one robster, any clues what sort of impurity caused it? Or gas bubble, whatever?
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Pillar of the Community
Australia
750 Posts |
Robster ...... you crack me UP!  Is thems weevils in them there spikes? (Real nice lamination  ) |
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Valued Member
Australia
236 Posts |
Seems I missed the humour "Pleeze explane" in my best Hanson voice. (which is not good)  |
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Pillar of the Community
Australia
674 Posts |
Ears of wheat can be infested by weevils.!! |
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Valued Member
Australia
236 Posts |
That was funny but that was the unicorn's comment wasn't it?
What did you say that prompted the unicorn's comment "Robster ...... you crack me UP!"
Is it a private joke or relating to something historical?
Actually don't worry, I'm content to not understand, it's getting bigger than Ben Hur. LOL
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Pillar of the Community
Australia
674 Posts |
Unicorn was commenting on the coin eg. die crack. Very few people understand nor care about our humour but it keeps us old guys amused.!!Hang around long enough and you too will totally ignore what we post.! lol.  |
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Replies: 42 / Views: 4,949 |
First Page
Posted 05/14/2013 8:03 pm
