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 Replies: 21 / Views: 2,332 |
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Pillar of the Community
Australia
1510 Posts |
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Formerly nancyc
Australia
5385 Posts |
Nothing of note on this coin, no crack, no error, no variety, just a stain.
life is a mystery to be lived not a problem to be solved
Edited by Nevol
08/07/2022 7:42 pm
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Pillar of the Community
 Australia
1510 Posts |
Maybe but the stain is covering the hairline cracks, or maybe you need too look at coin sideways  from what I see there's a hairline crack &  and where do you think yellowish Oil stain come from |
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Pillar of the Community
Australia
1510 Posts |
Well when I last seen metal being cut or extruded there's a yellowish oil on sheets before they extrude or cut and some oil can stay in or on metal also this may vary metal composition. |
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Pillar of the Community
Australia
1510 Posts |
Vary in metal composition.
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Pillar of the Community
Australia
1510 Posts |
Proof of cracked 20 cent.    I rest my case . |
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Pillar of the Community
Australia
1510 Posts |
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Pillar of the Community
Australia
1510 Posts |
Crack passing earring then fades too hairline crack to edge of coin.
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Pillar of the Community
Australia
1333 Posts |
hmm sorry would have to agree with nancy here just a scratch and not a die crack, or lamination flaw. You might want to take zoom up photos that are in focused as its offend very hard to spot die cracks.
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Pillar of the Community
 Australia
2505 Posts |
It is hard to follow, but I don't think Allcoinage is referring to die cracks, but actual physical cracks in some coins after stamping.
He has a thought that the design of the queens head has an inherent weakness (a stress raiser so to speak) which runs from the chin, up to the bottom of the earlobe and then accross to the left hand end of the tiara/crown. It may not be those points exactly, but I think that is the gist of his theory. He has raised this in several other topics previously.
I have no idea if it is right or wrong, but as I've stated before, I am open to any idea until it is put to bed.
The Ox moves slowly, but the Earth is patient.
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Pillar of the Community
Australia
1510 Posts |
Yes ttkoo that is what I'm addressing here about the weakness in that area, it could be a problem for ram mint if this isn't dealt with, I wouldn't care if I had an error coin or not |
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Moderator
Australia
16809 Posts |
OIl doesn't "leak out of cracks" on a coin, because there's no oil inside a coin to leak out of. And the oil stains weren't transferred from the die, because again, a coin die is a solid chunk of metal, it can't crack and leak oil out of it onto a coin. Further, coin presses operate at such high speeds, they don't use "oil", they use high-temperature grease - which is why "grease-filled die" varieties are a thing. The stains on your coin came from something outside of the coin - in other words, environmental damage. It's possible that a PMD crack formed on the coin, after exposure to heat and/or chemicals. The coin was then dumped in the staining environment, and the stain stuck to the crack better than the rest of the coin. But all of that hapened to the coin long after it left the Mint. The RAM has no control over what might happen to a coin after it's finished making it, and certainly can't control how a coin will react when it comes into contact with a chemically hostile environment. Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis
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Pillar of the Community
Australia
1510 Posts |
They get metal in sheets yes or no
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Pillar of the Community
Australia
1510 Posts |
Or does someone else cut them too shape and size of coins.
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Moderator
Australia
16809 Posts |
All Australian coin blanks are made in South Korea. They come already washed and rimmed, ready for striking.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis
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Pillar of the Community
Australia
1510 Posts |
 Or is this a scratch too  |
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Replies: 21 / Views: 2,332 |
Posted 08/07/2022 09:45 am
