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The Verdaccio undertone I referred to is a gray-green mixture made with Chromium Oxide Green, Mars Black, and Lead White.
I typically mix equal parts of COG to Mars Black to get a value 2 (Munsell scale) - this is my base pile from which I mix all others. I then darken some of it with MB to create value 1, and lighten the rest with flake white to create values 3-9.
You can also experiment with Yellow Ochre, Mars Black, Red Ochre, and Lead White to create a variant. You would mix the YO and the MB to create a green, and use the RO to knock it down in intensity.
Here are the approximate values:
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