Category: black...

diving for black pearls in Polynesia
black Moleskine notebooks
black belts in the martial arts
the pupil of the eye was once called the black
the black box, an aircraft's flight data recorder, is usually orange, not black
black derives from a root that means burnt or scorched
black is, optically, the total absence of color due to the absence or total absorption of light
perfect blackness being a rare attribute of objects; those from the surface of which very little light is reflected are commonly called black
black as the color of fertility in ancient Egypt
clergy dressed in black as a proclamation of faith and renunciation of vanities