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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.
In elementary science, far Ultraviolet light is called "black light" because, unseen (per se), it causes many minerals and other substances to fluoresce.
It absorbs nearly 30 times more light than the current standard for blackness[citation needed], and is 3 times darker than the current record holder for darkest substance.
In keeping with the law of conservation of energy, as a black color surface absorbs the light particles that hit it, the surface's particles are getting excited (excited particles = higher temperature).