140. The general classification of tones in which is shown
all the possibilities of value, color, color-intensity, and
color-neutralization, in reflecting pigments, is necessarily
theoretical, or rather ideal, because the degrees of intensity
obtainable in any value depend upon the pigment-materials we have to
use, or choose to use. No very great intensity of Yellow, even in the
value of High Light, can be obtained if we choose to use a mixture of
Yellow Ochre with Ultramarine Blue and White to produce it. It is only
when we use the most brilliant pigments—the Madders, Vermilion, the
Cadmiums, Aureolin, and Cobalt Blue—that we can approximate toward the
highest intensities, as indicated in our diagram and exhibited in the
Spectrum.