Scientifically speaking, black is actually every color, since technically it absorbs and holds every color in the spectrum.
Depends how you see it and reason it really. When is a color a color? isn't it that we see an object, light shines on an object and is reflected to our eyes by a specific wavelength which we interpret as a color? since black absorbs all light, all colors of our spectrum, nothing is reflected to our eyes, no specific wavelength, thus it is not a color. but usually what we see as black is not completely black, since it is still reflecting some light, not beeing a perfect absorber of light.