Color mixing charts--green and black

Canadian artist Zan Barrage has done a great job showing the mixtures of colors he has explored to mix low-intensity greens and blacks. I wish more artists would take the time to do this. They would have fewer problems using color in their artwork. It isn't the pigments themselves that cause the problems most of the time--it's not knowing their characteristics and how they will react in mixtures with other colors. Another important point is that the colors should be integrated throughout the painting and not just used to mix the green and the black.