Just got this 1970 half Kennedy. Advertised as silver GEM.

Forget about it. Get a nicer one for sure. Buy a 70 proof set and get all better coins

 

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@Djjohnson1019 what cmp9ball says. You'll be pissed everytime you look at it. Even madder when you try to get rid of it

 

Lol. Thats how i grade coins

 

Nah teach new members to return if not happy. @Djjohnson1019

 

Whats PVC again. Something with the holder right?

 

PVC= Poly Vinyl Chloride. It's a soft plastic which often comes transparent and was used for old 2x2 coin flips. Also it was used for making "coin pages". The plastic polymer chain contains Chlorine atoms (Cl) and when the plastic decomposes the Chlorine is released. This is extremely reactive against copper and silver coins forming discoloration before eating away at the metal turning it to a "salt".

To remove PVC residue, the coin should be rinsed with acetone and perhaps sent in to be professionally conserved.

 

watch the coins you buy very carefully as this is one you should have not bought I would return it​

 

PVC is actually a Hard opaque plastic that is very stable ( used in plumbing) BUT when used in coin products to make them flexible and soft to avoid scratching, plasticizers ( a different chemical) are added. Overtime and temperature they leach out if they get on a coin producing acidic products which can damage the coin. Some of the flips and holders today are PVC and transparent as they have different ( more expensive) plasticizers that do not leach as easily. Many dealers ship coins in a softer PVC flip to avoid damage due to sliding during delivery and should be removed and into a mylar flip if you wish very long term security. Jim