i would tend to agree with this. Not exactly the same, but if you put a magazine in a car window, the first colors you will lose will be the reds. I had a Hot Rod mag in a windshield and it lost almost all of the reds.
I also believe that warped plastics are probably to some extent the result of heat from bulbs, probably poor support. etc. If you have a larger plastic it doesn't take a lot of heat to cause it to sag over time. it just has to heat a little and its own weight will help it to sag/warp.