Chromatic light-dark contrast are illustrated in twelve equidistant steps from white to black and have been repeated ford each of the twelve
hues of the color circle, in brilliances equal to the corresponding grays. Pure yellow becomes the fourth step. Orange is the sixth step, red
the eighth, blue the ninth, and violet aht the tenth step in the scale of grays. The chart shows saturated yellow to be the lightest of the pure
colors, and violet the darkest.