color wheel

I've been asked to teach a watercolor class in the winter term at our local art center. I'm a bit adamant about learning to mix colors, maybe because I don't want to spend the money on heaps of tubes of different colors. So yesterday I worked on creating a color wheel using only three colors: rose, cobalt blue and yellow. I used the complementary color (the color opposite on the color wheel) for the shadows on and of the balls. I may do this again, varying the red, blue and yellow, to see which combination I like best.