TONIC CORE MIXING SET This essential set of Tonic Watercolors includes extra-large porcelain pans of specially selected mixing colors. We've included six different primary colors, two from each color family, as evenly spaced on the color wheel as possible. This "split-primary" arrangement includes warm and cool colors from each primary family (red, yellow, and blue.) It's a modern mixing system that allows for much more intense color than traditional three-primary mixing. The colors included are Quinacridone Magenta (cool red), Federal Red (warm red), Signal Yellow (warm yellow), Permanent Yellow (cool yellow), Phthalo Cyan (cool blue), and Ultramarine (warm blue.