Questions about PVC?

Ok, So, Im pretty sure that we all know PVC flips and the like are bad for coins because they cause green slime and pitting.. but here comes the real question. How do you know if something contains PVC? Like is there a warning on them? Does the price of flips indicate whether there may be PVC? Does PVC have a tint or a feel? I have asked a few people and not many answers have come my way.. so Im curious.
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