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How did this happen?
Posted: Sat May 28, 2022 4:19 pm
by rogerg

- Heri.jpeg (172.07 KiB) Viewed 2410 times
This sold at a famous auction house eight years ago. Nice clean looking coin, now it is up at another house and it is tarnished. I don't say toned. I have long suspected that holders could "leak". That would mean that all those colorful coins people are paying premiums for will one day be BLACK.

- GC.jpg (176.91 KiB) Viewed 2410 times
Re: How did this happen?
Posted: Sat May 28, 2022 6:13 pm
by messydesk
Slabs are not impervious to gasses. This one may have spent some time in a hostile environment, maybe intentionally, maybe not.
Re: How did this happen?
Posted: Sat May 28, 2022 8:20 pm
by RogerB
Kentucky coal mine?
Re: How did this happen?
Posted: Sat May 28, 2022 10:40 pm
by blh74
Is that from a poor rinse from a dip?
Re: How did this happen?
Posted: Sun May 29, 2022 12:07 am
by messydesk
Those are usually splotchier than this. It also looks like the basket prong at the top protected the coin from toning there.
Re: How did this happen?
Posted: Mon May 30, 2022 11:38 pm
by blh74
messydesk wrote: ↑Sun May 29, 2022 12:07 am
Those are usually splotchier than this. It also looks like the basket prong at the top protected the coin from toning there.
I see the unaffected area now.
Re: How did this happen?
Posted: Tue May 31, 2022 3:50 pm
by Andy Hansen
Those older holders used "rivets" which, I don't believe are as tight as the newer holders.
Re: How did this happen?
Posted: Tue May 31, 2022 4:49 pm
by Longstrider
May be the work of a Coin Doctor.

Re: How did this happen?
Posted: Tue May 31, 2022 8:31 pm
by fogie
Oxygen + silver..
Re: How did this happen?
Posted: Tue May 31, 2022 9:54 pm
by Vam-mysterio
I actually like it better ,
Such of a high grade coin,
With that toning
Though is not original
But artificial ,
All white just looks plain to me