107. Three-Color Study: Green Plums July 7, 2018July 5, 2018Categories Chatter, WatercolorLeave a Comment on 107. Three-Color Study: Green Plums Plums are appearing in the markets, and they are great to eat out of hand and to paint. I used Hansa Yellow, Cobalt Teal, and this time, Lamp Black to see how it would work with the other two colors. No reds in this triad.