Lots of different versions of primary colors.
Subtractive (what crayons and printing presses do) is cyan, magenta, and yellow (plus black, for presses).
Additive (what your computer screen does) is red, green, and blue.
Opponent process (what the rods and cones of our eyes do) is red, green, blue, yellow, white and black (actually red versus green, blue versus yellow, and white versus black).
And then, in some contexts, "primary colors" simply means the colors of the rainbow: red, orange, yellow, green, blue, and one or more versions of purple (indigo, violet), plus black, white, and sometimes brown and grey.
That last version is the one I was using. :good!:
