Most Helpful Guy
Yes they do.
In fact, if you are blond and spend a great deal of time in a chlorinated pool, your hair will begin to get a tinge of green.
This explains it...
Most Helpful Girl
Yes, they both do, but they damage it in the process. Keeping your hair away from the sun is important, especially when you're in the sun a lot, and for chlorine, I'm not exactly sure if they lighten it by a lot, but in my experience, it damages your hair.