While they don't take a whole lot in the car it is because my car has UV tinted windows so you are not getting the sunlight that you need. But once you really go out in the sun!
They sure do turn purple! I freak out every time, it so cool!
You just have to watch my video and see them change its crazy. I love love love them and the company is great too.
Make sure you head over to DEL SOL and see what deals they have going on now till Dec 12th