Black is actually a tone, not a colour. Black absorbs more than 95% of visible light. Although it may be difficult to tell just by looking, not all black colours are equally dark and some are darker than others. A company called Surrey NanoSystems has created the world’s darkest black and they call it Vantablack. Very dark black can be used to improve the performance of cameras and telescopes. It may also be used to improve equipment in the military.