Page:Atlas of the Munsell color system.djvu/25



CHART

CHART 20. DARK SCALES OF HUE AND CHROMA, REFLECTING 20% OF THE INCIDENT LIGHT.

This chart is a horizontal section through the color solid, similar to chart 50 except that the shorter radii describe a loss of chroma as colors darken.

Each radius from the neutral centre, $N 2⁄&nbsp$, 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 scale is given ten equal and measured steps, so that the symbol $B 2⁄4$ indicates that this particular dark blue reflects 20% of standard white and 40% of the strength of the maximum standard vermilion.

To balance any pair of opposite colors on this chart, such $B 2⁄4$ and $YR 2⁄4$ the area of each color should be in- versely as its chroma, i. e., four parts of $YR 2⁄1$ with one part of $B 2⁄4$.

To balance this dark $B 2⁄4$ with its corresponding light $YR 8⁄5$ (orange), on chart 80 the area of each should be inversely as the product of its symbol, thus eight parts of the light orange balance forty parts of 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 hand book, "A Color Notation"

AVOID DUST, HANDLING AND EXPOSURE TO STRONG LIGHT.