Color Mixing Exercise
Download a blank pdf of this diagram and try this color exercise. I ask my students to try it with all their colors, and then with a few sets of primaries-- say (alizarin crimson/ultramarine blue/cadmium yellow) or (Cadmium red/Cadmium Yellow Light/Cerulean Blue. Or, use your colored pencils to get the same result. The point of the exercise is lost if you use secondary or tertiary colors! Primaries only, whatever they may be. Keep in mind that if you mix a purplish red with greeny blue you will get a neutral secondary.
Mix around the color wheel, not across it. Keep your brush clean!