Black, Black

See also Primary colors In physics, a black body is a perfect absorber of light, but by a rule derived by Einstein it is also, when heated, the best emitter. Thus, the best radiative cooling, out of sunlight, is by using black paint, though it is important that it be black (a nearly perfect absorber) in the infrared as well.

It absorbs nearly 30 times more light than the current standard for blackness 30 times darker: , and is 3 times darker than the current record holder for darkest substance. Scientists claim that the new material has great potential in the manufacturing of solar panels.

Light (electromagnetic radiation in the visible spectrum) interacts with the atoms and molecules which causes the energy of the light to be converted in to other forms of energy, usually heat. This means that black surfaces can act as thermal collectors, absorbing light and generating heat(see Solar thermal collector).

Thus the black belt is a mark of achievement and seniority in many martial arts, whereas in, for example, Shotokan karate, a white belt is a rank-less belt which comes before all other belts.

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