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A question about PVC.
keets
Posts: 25,351 ✭✭✭✭✭
I was looking at this coin on eBay --- https://ebay.com/itm/1942-S-Walking-Liberty-Half-Dollar-MS63-NGC-Toned-1633-/192915171168?oid=192878852046 --- and noticed a hint of green on the obverse(behind Ms. Liberty's buttocks in the flag fold) as well as the reverse(scattered from the motto, across the Eagle to the other rim). Looking at the NGC cert pictures ---https://ngccoin.com/certlookup/4701665-043/63/ --- there doesn't seem to be any color.
My question would be has the green shown itself over time or is it just something such as a reflection in the sellers pictures??
Thanks in advance.
Al H.
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Hard to tell. I wouldn't expect a dark green like that to appear over time. The coin would have had to have been very sticky when put in the holder.
Reflectivity through thin films can create all kind of color affects: think rainbow hues on the top of a greasy puddle in a parking lot.
All comments reflect the opinion of the author, even when irrefutably accurate.
PVC is known to manifest itself over time in this way as green, that's why I asked.
It's usually an expensive thing to get the pvc removed. I have never seen a gold or silver coin permanently damaged by pvc, though I'm sure there have been cases, not sure what the criteria is required for permanent damage.
This case looks pretty minor. Anecdotally, I have had several percent at least of coins rejected by CAC due to pvc.
Gold is inert to PVC contamination eating into the surface although Silver and Copper isn't.
I don't understand why the grading services just don't alert the submitter that for a nominal charge they can remove the PVC prior to encapsulation.
I know. But to have been clear when slabbed and ended up that dark green, it would have had to have been a very sticky coin when slabbed. IMHO
All comments reflect the opinion of the author, even when irrefutably accurate.
Seller has probably bumped the contrast so the green may be stronger than it is in hand, but I have very little doubt that is PVC.
Aercus Numismatics - Certified coins for sale
I would also note the PVC can also be seen in the ngc cert. The eagles claw shows it for sure. Just a photography difference.
Aercus Numismatics - Certified coins for sale
she farted
@keets saw: said:"... a hint of green on the obverse(behind Ms. Liberty's buttocks in the flag fold) as well as the reverse(scattered from the motto, across the Eagle to the other rim). Looking at the NGC cert pictures ---"
"My question would be has the green shown itself over time or is it just something such as a reflection in the sellers pictures??"
The images don't give much to work with but I do see the hint of green behind "Liberty." IMO, this was on the coin when graded. Light PVC haze shows up best under florescent light. When it gets as this spot, it is not light and not something that just happened to get worse. All of this is just IMHO of course.
@logger7 said: "It's usually an expensive thing to get the pvc removed. I have never seen a gold or silver coin permanently damaged by pvc, though I'm sure there have been cases, not sure what the criteria is required for permanent damage. This case looks pretty minor. Anecdotally, I have had several percent at least of coins rejected by CAC due to pvc."
Most "PVC" can be removed cheaply by anyone once they are showed proper technique. There are several common chemicals that do the trick. Don't rub the coin!
PVC byproducts will eventually DAMAGE the surface of silver, nickel, and copper - there are many variables that influence the reaction.