The ideal thing would be to take advantage of all the sun's rays, but there is no polymer capable of absorbing the light at all the wavelengths. (sciencedaily.com)
I view black as a complete lack of color, as the pigment completely absorbs all light in the visible spectrum and doesn't reflect anything back. (40plusstyle.com)
The particle, like an atom, will also absorb light of certain frequencies. (scientificamerican.com)