I'm guessing this never installed Milgard sliding window is less than five years old, but it was left out in the rain for a while. This model has a bronze exterior, with flush to outside of building trim flange, and white interior. There's still an energy tag on this one. Any blue you see in the photos is the leftovers of the tape Milgard wraps these windows to protect the exterior finish, which may now have some cosmetic damage.