The most interesting black product I've seen was a projector screen Sony showed at CES one year, around 2002 or so. The screen looked extremely dark in ordinary room light because it absorbed almost all light except the precise wavelength of the red green blue projection from a video projector. I don't know if part of the trick involved the polarization of the light source as well as the wavelength. It was quite amazing how vibrant the image looked under lighting that would have made any other front projection image look washed out.
I believe the Sony screen never made it to market. It was supposedly very expensive to make, brittle (so the screen cannot roll up) and people hated the look of a big black screen on the wall (I guess they never considered some kind of cover or valance).
I believe the Sony screen never made it to market. It was supposedly very expensive to make, brittle (so the screen cannot roll up) and people hated the look of a big black screen on the wall (I guess they never considered some kind of cover or valance).