p>So I started using just a neutral yellow, a cool red, and ultramarine blue. I 
liked the ultramarine because I like intense violets and dull greens in my 
landscapes, and ultramarine lends itself well to both. Every so often I would 
find the need to have a more intense green than I could mix this way, so I added 
an intense green to my palette. It also helps me get more realistic sky color 
when mixed with ultramarine blue. For a while I was still thinking mixing 
oranges were a problem, so I put t