This was pinned for the color by some (Sherwin Williams Aqueduct), but I love the idea of painting the back-side of any door. What a fun way to make a pop (kids room?) or an unexpected splash of color (guest room?
Colourbond Shale Grey in a Taubmans paint combined with a colour bond Surf Mist roof. trim is just plain white paint with no tint. If you need your paint to have a name use Dulux Vivid White as that is really white with no tint.