131. We must now proceed to the consideration of the qualities of
light beyond the Scale of Neutral Values, in the region of colors and
color-intensities,—a region of tones which we have not yet explored.
It is evident that no color can exist either in the value of Black or
in the value of White, but in every other value we have the possibility
of all colors. That is to say, we may have Red (R) or Orange (O) or
Yellow (Y) or Green (G) or Blue (B) or Violet (V) or any of the colors
lying intermediate between them,—Red Orange (RO), Orange Yellow (OY),
Yellow Green (YG), Green Blue (GB), Blue Violet (BV), or Violet Red
(VR): all these, in any value of the Scale of Values, except in the
value of Black and in the value of White. The possibilities of value
and color, in tones, are exhibited in the following diagram:—