Simple explanation - to qualify as Red the coin has to retain 95% original mint red. Red colored toning does not qualify as original mint red. So the coin is given the RB designation which only requires 5% orignal mint red.
There is no PVC in these. What you are seeing is haze/toning, IMO, and acetone will have no effect on it...MIke
I like it a lot better than some R coins that I have seen though, I am NOT a toning fan, but that is a nice piece.