Another limited palette
Here is a limited palette espoused by Jose Parramon in his book, Theh Big Book Of Oil Color. It works fine. He gives many descriptions of making every color there is, including earth colors, with these few colors:
Alizarin Crimson
Cad Yellow Medium
Prussian Blue
White
Prussian Blue is a very powerful color, and so you can get some industrial strength greens from it with CYM.
CYM and AC will give you reds going from "true" red out to the orange reds.
All three mixed in various combination will give cold, neutral and warm blacks.
Right now, I'm using vermilion, a mix of yellow ocher and cad yellow medium. burnt sienna, cobalt blue and raw umber. For very dark darks (warm or cool) I use aliz crimson, ultramarine blue, and burnt sienna. You can get very warm or very cool darks with this.
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