Excellent introduction to color and paint quality (from acrylic to oil to watercolor). It explains the difference between opaque and transparent colors. It removes the mystery of names given by manufacturers focusing instead on the industry standard labels. Recommends a basic pallet of 6 colors and a secondary set of another 6 colors. Describes how to mix all different colors and create color charts. Plenty of examples. Wilcox books were recommended by Richard Schmid in his book Alla Prima II.