PVC?

commoncents05

What is this Indian covered in? I think it's PVC, but I want to see what others say.

Link.

-Paul

Cgb

I'd say its covered in fine haze of missing.

commoncents05

fixed link

-Paul

Animalkeeper

PVC or corrosion inside a PCGS slab - my worst nightmare. I sold my circulated IHC set and began an unc set because of this. It can show up months/years later.

DorkGirl

It's not PVC, it's verdigris.


edited for spelling..

ricko

It appears to be verdigris..... not PVC. Cheers, RickO

RedStorm

Agree on the verdigris diagnosis. PVC is a bit different color green and tends to be an issue on the high points of the coin (where it was in contact with the vinyl) as opposed to down in the nooks-and-crannies.

NumisOxide

I agree with verdigris but I find it distracting.

dcamp78

Yep, verdigris. It also has that 'wood grain' look to it.
This occurred during planchet preparation and should not affect value.

Animalkeeper

Education - that's why I'm here.

Exactly how does PVC and verdigris differ? Don't they both corrode the surface of copper coins, i.e., damage them? I have understood that copper's "patina" when it becomes weathered is verdigris.

It is certainly distracting - whatever it is. Won't those area, if let unabated, enlarge?

pb2y

The coin appears to have been poorly cleaned and rubbed with
a sulfer solution or paste similar to Dellers. Sulfer will react with copper
but IHC are bronze and the reults are unpredictable. The same is true of
early American copper coins of questionable alloy.
The slightist residue of sulfer left will continue to react with the metal
and in time turn white and is impossible to remove. This is one of the
things graders look for and these specks will result in rejection. The slabbed
IHC must have made the grade before any of this occured???
The photo shown is from a recent Forum thread.

darktone

I am surprised a coin with corrosion made it into a slab.

ldhair

I'm thinking verdigris as well.
I'm not sure why but an image can make this a much brighter green than it actually is on the coin.

dorkkarl

it's covered in toning plus it has some verdigris

K S

7Jaguars

Verdigris penetrates the metal as has been proven and on bronze has sometimes been known as "bronze disease" as it is not easily if at all conquered. PVC is an oily residue of mostly soft plastics that adheres to the surface of the coin and as there are some chorides in it leaches out some of the host metal giving it the light oily greenish color. If not too old or aggressive it can usually be removed, esp. with acetone. Not so for verdigris...