so i was looking at my animated optimus prime the other day and notice something strange. the painted half of the upper shoulder area was a bright red as ever, but the bare red plastic portions had dulled down and become not just a tiny shade off but a completely different looking tone of red. looking over the rest of my collection i could see that the reds on plastics had also changed somewhat. not as bad as the animated optimus mind you...but not as vibrant as they once where. im not sure if this is normal or what could have caused something like this to happen since they are all in display cases and in a non smoking, light controlled, air conditioned home. is it normal for a toy to lose some of that "factory" color?