Page:Atlas of the Munsell color system.djvu/33



CHART

CHART 60. SCALES OF HUE AND CHROMA, REFLECTING 60% OF THE INCIDENT LIGHT. This chart is a horizontal section through the color solid, similar to chart 50 except that all its colors reflect 10% more light.

By comparison with chart 30 it will be seen that this weakens the field of purple-blue although it strengthens the yellow field. Each of the ten hues exhibits its Scale of Chroma on a radius from the neutral centre $N⁄6$ to the strongest color obtainable at this level in stable pigment. Thus P and RP have but four steps of chroma while YR, Y, GY, and G extend to the seventh and eighth step. This also appears in the symbols printed on each color, where the initial gives the hue, the upper numeral is the value and the lower numeral the chroma.

To balance any opposite pair, such as $G 6⁄7$ and $RP 6⁄4$, we should use seven parts of the weaker RP with four parts of the stronger G. The quantities of color which balance are thus seen at a glance. Each concentric circle traces equal chromas through the circuit of ten hues, and the suggestions for selecting color sequences which appear on the other charts may be applied here. See Chapters III and IV of "A Color Notation".

AVOID DUST, HANDLING AND LONG EXPOSURE TO LIGHT