The Color Spectrum

Black light

Black is similarly not a color itself, but is the absence of light Objects appear black when they absorb light of all visible frequencies. Carbon soot is an excellent absorber of light and looks very black. The dull finish of black velvet is an excellent absorber also. But even a polished surface may look black under some conditions.

Absence of light

Most of the light that gets between the closely spaced edges of the blades gets trapped and is absorbed after being reflected many times. Black objects that you can see do not absorb all light that falls on them, for there is always some reflection at the surface. If not, you wouldn't be able to see them.