French Ultramarine is one of my favorite blues. It is a semiopaque, warm blue that mixes well with other transparent nonstaining colors. It is a good color to use as foreground shadows. It sits between Winsor Blue and Ultramarine Violet on the color wheel.
See Alizarin Crimson. The color Permanent Rose, a pure transparent color, can be used as a substitute for Alizarin Crimson as the PRIMARY RED on the color wheel. Permanent Rose is also the RED used for the layered wash – glazing watercolor technique.
Cobalt Blue is a pure transparent color that is considered to be a neutral blue. It is the BLUE used for the layered wash – glazing watercolor technique. For the PRIMARY BLUE in color schemes, see Winsor Blue.
Hooker’s Green is a more neutralized color than the pure transparent Viridian. So, I have not included it in my color schemes. It is a warm green useful in mixing a variety of greens for expressing landscapes and receding planes.