Quote Originally Posted by zanthrax View Post

You can mix pretty much any solid color using just red, yellow, blue, white and black.
Here's an example for mixing a sand color:

I recently mixed my own mustard paint using Hobbynox paints using mostly yellow, a few drops of red and a drop of white and black. I used a $35 airbrush, it's not great but it works.
Great info, thanks for sharing!