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Pesky sap green
As to that pesky sap green thread...I've discovered you can make those lovely burnt reds, rusty reds, and reddish browns several ways, none of which use sap green.
A little aliz crimson, burnt sienna (transparent oxide red, too), and ultramarine blue. Fiddle with it until you get the depth and warmth you want.
Plain old cadmium red light and ivory black will produce some interesting rusts, reds, browns.
Alizarin crimson, cadmium yellow med and Prussian blue will also make some of those intense rusts/browns. You have to fiddle with, and tweak these colors too. But, actually, you can make any color (almost any color) there is with these three and white.
I used to mix Greene's sepia green mixes (also using sap green, alizarin crimson, and cadmium yellow). You just go heavier on the sap green, dull it with alizarin, and lighten it with cadmium yellow. However, I found few uses for this. If I need greens, there ares raw umber/yellow ocher, ivory black/yellow ocher, raw sienna/black, and so on.
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