The visible light spectrum corresponds to the range of wavelength from
0.38 to 0.76 microns of the electromagnetic radiation spectrum.
Solid materials that have an absorptivity, α, close to 1 (a material with
α = 1 is called a black body, and absorbs all the thermal radiation that
hits him including visible light, a hypothetical concept) absorb most of the
incident light radiation. Materials that have a mat (lusterless) black color
have α close to 1.