[AntonioLao]

Black as absence of light is not a color. However, the science of color described different hues as the reflected or refracted polarized energy variations when light interacts with matter. The inability of any object to reflect or to refract would strongly suggest total absorption. On the other hand, total non-dispersive transmission of light in transparent media would also indicate the color black as if one is looking at the back of a photon moving away along the line of sight. When a photon moves toward a point-observer without any spatial extension, then one says that an energy source exists.

Planck’s quantum theory of radiation considered all blackbodies as perfect absorbers or perfect emitters for all thermal dependence radiations. What are absorbed or emitted were waves of all possible wavelengths and frequencies. For Maxwell, each wavelength (l) corresponds a unique frequency (n) such that their product is always a constant c, the speed of light. For Planck, the ratio of energy to frequency is also always a constant, h, the quantum of action, and the product of wavelength and linear momentum is also always near the value of h. Although Maxwell asserted that the constant c as an intrinsic property of all electromagnetic radiations including visible light, he did not emphasize the fact that the visible spectrum seems to lie between two extremes of the color black of high frequency and long wavelength. The reality of high frequency seems to stop at the formations of matter waves or black holes while long wavelengths seem to stretch beyond the extension of the visible universe. Both terminated at the edge of the boundary between quantized space and continuous spacetime.