The Definition of Particular Tones
139. To define any tone, in this classification, we must name its value, its color, and the degree of color-intensity or neutralization.
The Classification of Tones Necessarily Theoretical
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.