Through an inter library loan I got hold of Richard Schmid's book, "Alla Prima." Very enjoyable reading and wonderful reproductions of his paintings. He is a strong proponent for creating color charts of your palette... each color in five steps down to pale tinted white and then each color mixed with every other color, one at a time, also down to pale tinted white in five steps. I've never done color charts before. I'm finding it quite an impressive and instructive task. I've been at it for several days now, so the painting is on hold for a moment.