Page:Atlas of the Munsell color system.djvu/37



CHART

CHART 80. LIGHT SCALES OF HUE AND CHROMA, REFLECTING 80% OF THE INCIDENT LIGHT.

This chart is a horizontal section through the color solid, similar to chart 50 except that the relative chromas change as their hues approximate to white.

Each radius from the neutral center, $N⁄8$, is a scale of chroma for its hue and displays the strength obtainable in stable pigment at this level. Each step in the scale bears its appropriate symbol by which the color is known and written. For simplicity the chroma scale is given ten equal and measured steps, so that the symbol $Y 8⁄9$ shows that this strong yellow reflects 80% of the incident light and 90% of the strength of the maximum standard vermilion.

To balance any pair of opposite colors on this chart, such as $B 8⁄2$ and $YR 8⁄5$ (light orange), the area of each color should be inversely as its chroma, i. e., two parts of $YR 8⁄5$ with five parts of B

To balance $Y 8⁄9$ which is very light and chromatic, with its dark complement $PB 2⁄2$ on chart 20 which is of weak chroma, requires that the area of each be inversely as the product of its symbol, thus four parts of the powerful yellow balance seventy-two parts of the dark blue.

The suggestions for selecting sequences and groups of color which appear on chart 50, are also applicable here, as indicated in Chapters III and IV of the handbook "A Color Notation."

AVOID DUST. HANDLING AND EXPOSURE TO STRONG LIGHT.