Mixing Purples, Oranges and Greens from primary hues.

Mixing Purples: Reds are placed along the top. Blues and one green with a blue undertone on the left side. Note how some mixtures are pure neutrals with separation of pigments as they dried. Some wonderful Red Violets emerged and Blue Violets. Some Blue mixtures of blues simple were just blue. Look at the separation qualities of some of the pigments.  Some pigments are heavy and settled to the bottom while other pigments are light and set on top of the mixture. A Happy Experience.

Mixing Oranges.  Warm Yellow Hues are place along the top. Red Hues are placed on the left side. Follow the line of color to see what mixed Hues are made from two different pigment

Mixing Greens Note the different warm tones along the top of the page used for a green Hue mixture. Cool colors were placed to the left. Pigments were then mixed. Fascinating how some pigments are transparent and pure other are have granulation properties others opaque.

About these mixtures: There are many different books with exercises to mix secondary colors. It is of up most importance that you create your own charts with the pigments that you like and have preference too.
Then these mixtures become your own and you will have knowledge of how best to orchestrate them on your design.