Vitruvian: Lexicon: Number of Non-Derived Basic Colour Categories: 6
For saturated colors: non-spectral magenta, red, orange, yellow, chartreuse, green, cyan, blue, and purple. For unsaturated colors: magenta thru orange = brown, yellow thru green = olive, cyan thru purple = "lithichrome". For non-chromatic colors: black, gray, and white.
