A follow up from the no black/white discussion...I want to mix quite a large amount of neutral, obviously with some warm/cool variety. The common choice is ultramarine/burnt umber. I'm wondering if and when you might use other complementary combinations to get a strong neutral. I was thinking of red/green. There are of course lots of reds and greens, but together you will certainly get a neutral. Any pitfalls? Has anyone tried, for example, viridian plus alizarin? Or say sap green plus cadmium red? I've sometimes bunged some straight black into a mixed neutral to deepen it. So, you go red-green-black, and then just various red-green combinations? I have a particular scene I want to paint which is a forest in the gloaming. It's quite dark, but what I see are reds and greens. Curious to know what others are doing re neutral.