YES!
Although I might want to argue with marboman about there only being eight colors and then blends. From that perspective, there are really only five colors, if you count black and white -- the other three being red, yellow, and blue -- the only colors that can't be made by blending any other colors together.
And, acourse, we could debate whether or not black and white are colors, if you want to, or are they the absence of all colors and the presence of all colors? And acourse, they switch, depending on whether you're talking about pigment or light . . .
Gee, I love marbles . . .