Is this PVC, or something else? **Updated**
kaz
Posts: 9,207 ✭✭✭✭✭
When I started collecting, all of 3 years ago, I was attracted to the shiny, multipage ads in CW et.al. (See where this is going?
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Among my early purchases were 1932-s and 1932-d quarters, both "BU" but at AU Prices!! What a deal!! Wary of being sold fakes, I sent them off to ICG (the old ICG in CO., at that time fairly picky and refusing to slab problem coins). The 1932-s came back as AU53, the 32-d as AU55, and thus I was introduced to the numismatic term "slider." Three years later, I decided to take the coins out of the SDB to photograph them. Now, the 32-d looks fine, but the 32-s has some milky spots on it that I don't recall being there initially. Do you think I'm just seeing a dip gone bad, or PVC? Nothing green at all, but the spots are sort of milky-gray. I cannot see any corrosion into the metal. Thanks for your opinions, my friends.
)Among my early purchases were 1932-s and 1932-d quarters, both "BU" but at AU Prices!! What a deal!! Wary of being sold fakes, I sent them off to ICG (the old ICG in CO., at that time fairly picky and refusing to slab problem coins). The 1932-s came back as AU53, the 32-d as AU55, and thus I was introduced to the numismatic term "slider." Three years later, I decided to take the coins out of the SDB to photograph them. Now, the 32-d looks fine, but the 32-s has some milky spots on it that I don't recall being there initially. Do you think I'm just seeing a dip gone bad, or PVC? Nothing green at all, but the spots are sort of milky-gray. I cannot see any corrosion into the metal. Thanks for your opinions, my friends.
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From my experience, PVC starts out as a milky haze like this, and turns greenish and 'goopy' over a period of time, depending on qty of PVC in the holder, ambient conditions, etc.
Website-Americana Rare Coin Inc
There are at least a couple of possibilities as to how it got that way - the cleaning agent that the original dealer used may have left a slight residual on the surface to slowly react and eventually caused oxidation giving the white appearance. Secondly, these TPG holders are NOT airtight and environmental substances in gaseous form can penetrate the holder and cause such problems; finally the holder itself may break down and cause some oxidation.
Dip may have the ability to "clean" the surface by eating a bit more of it away but then the metal may be a bit raw and subject to develop a new "skin", sometimes not so desirable...
Well, just Love coins, period.
The spots are gone! I can't see any damage to the surfaces beyond the circulation marks! I suspect it was residue from a previous dip that had not been rinsed off, as the dealer I bought it from is well known for his bright "BU" coins. All's well that ends well. It's also a good idea, I believe, to take a close look at your coins from time to time, in order to pickup on developing problems and deal with them. Had I not decided to photograph my collection, it would have remained in the sdb, silently stewing and turning into Lord knows what. Thanks again to all those who offered assistance and helpful observations. Kaz
Well, just Love coins, period.