With so many people saying black is the absence of color, I would like to share what I learned in school regarding black and white. When it comes to light, white is all colors combined, and black is the absence of color. With pigments, however, white is the absence of color, and black is all colors combined. Not that anyone really cares, though. :-)
It depends upon what you call a color. As I see it, a color is a particular sensation. And for the most of the colors that humans can see there exists quite a significant variety of combinations of different light waves (with quite different wavelengths) that can produce the sensation of this same color in our brains (retina is practically a part of brain). That's because our eyes are not directly sensitive to the wavelength of light, unlike the case of our ears being directly sensitive to the sound frequency. Instead we have three pigments (so far as color vision is concerned) each of which is sensitive to the intensity of light in a certain particular region of light spectrum. And these regions are actually overlapping. In fact there are colors that can only be seen against a background of other colors. And don't forget about afterimages... Also the things that appear black to us can reflect quite a lot of light outside the visible spectrum. So it's not that simple and colors and light waves are quite different things in general. Although no light is required to produce the sensation of "blackness" (though usually we call something black only when there are brighter objects nearby), the sensation itself exists, and it is called a "black color".
By the way, you can never really experience the absolute "pitch black" absence of all the other colors even in absolute darkness. Lock yourself in a dark room and look around. Just don't tell yourself that you "see nothing". What you will see will be a tiny glowing multicolored "noise" a bit like that of a TV when it isn't tuned to any channel, only much weaker. (But it can get somewhat stronger when you start noticing it, and you can all of a sudden start to discern vague symmetric structures in it, strangely resembling some occult and religious symbols. I assume that it could be the ultimate origin of a lot of those. And it could be that very "light that shines in the darkness" that biblical Jesus from Nazareth was talking about.) And it never dies out. It's always there. If you are alive, awake and your brain isn't seriously damaged at least. But it doesn't mean that black doesn't exist or that it isn't a color. It just means that these things are relative and they have a lot to do with the inner machinery of our brain.
Anyway, ultimately it's just a matter of terminology. If you are talking about the color of light, then it cannot be black. If you are talking about the apparent color of a certain surface or part of it, it can have a black (i.e. very very dark) color. But in the case of sound we usually apply such words as "tone" or "pitch" just to the sound itself, and not to the object that produced it. So we don't have silent sound just as we don't have black light. But if there were a notion of "solor" of an object, then, I guess, there would exist a silent "solor".
WOW!!! Just - simply - WOW!!! I've never in all my life read, nor even heard, someone explaining any matter so thoroughly and you actually simply did it for free! Seriously this was amazing -both the knowledge and effort to to write all this so that people wouldnt even care to read nor even vote!!!
After ''wow'' one thought - rather feeling - came from within, which was: ''I need to have this'' X ) så, I come here to ask you if I may save it in a document-file for personal interest/usage for me to not forget or lose it.
60/10 reference rating - brilliant! : )
And yet even though that is the way the colors of light are interpreted, I choose to believe black is absorbing all the colors, so that as in paint, it is actually a mixture of all the colors. Of course then that would mean that the color we see, is the only color that things are not because they have rejected or reflected it. Then white which in light is considered a mixture of all the colors would be a reflection of all colors and so the object would be colorless, just like a polar bear's fur.
This is just a matter of "day-life" / scientist vocabulary. In normal day-life talking, black and white are colors, but in a scientific way to talk about colors, they are not, as colors are all the spectrum in-between the absence of color-waves mix (black) and full color-waves mix (white). It is a bit the same when taking about vegetables. In your kitchen, potatoes, carrots, tomatoes, etc, are vegetables, but in a scientific way, "vegetables" does not mean anything : potatoes and carrots are roots, tomatoes are fruits, etc...