Page:Atlas of the Munsell color system.djvu/27



CHART

CHART 30. DARK VALUE SCALES OF HUE AND CHROMA. This chart is a horizontal section through the color solid, similar to that of chart 50 except that all its colors reflect but 30% of the incident light.

Each radius is a scale of chroma, whose steps appear written beneath the line. Thus $R undefined⁄7$ is the seventh step of red and reflects 70% of the strength of standard vermilion. Its opposite hue,—blue-green, has but four steps of chroma at this level, and to balance these uneven chromas, the area of the weaker must be seven fourths as great as that of the stronger color.

Each concentric circle traces hues of equal chroma. A sequence of regularly decreasing chroma may be traced thus: — $PB undefined⁄8$, $RP undefined⁄6$, $YR undefined⁄4$, $GY undefined⁄2$, $N undefined⁄3$-. The suggestions on chart 50 may be applied to this chart as indicated in chapters III and IV of a "Color Notation."

AVOID HANDLING AND EXPOSURE TO DUST.