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''The color definitions here employed are taken from the Century Dictionary. Special attention 1s called to the cross references which serve to differentiate HUE, VALUE, and CHROMA.''

—An image perceived after withdrawing the eye from a brilliantly illuminated object. Such images are called positive when their colors are the same as that of the object, and negative when they are its complementary colors.

—Of the color of the clear sky; of the color of the spectrum between wave lengths .505 and .415 micron, and more especially .487 and .460; or of such light mixed with white; azure, cerulean.

—Possessing in the highest degree the property of absorbing light; reflecting and transmitting little or no light; of the color of soot or coal; of the darkest possible hue; sable. Optically, wholly destitute of color, or absolutely dark, whether from the absence or the total absorption of light. Opposed to white.

—A dark color, inclined to red or yellow, obtained by mixing red, black, and yellow.

CHROMA.—The degree of departure of a color sensation from that of white or gray; the intensity of distinctive hue; color intensity.

—Relating to or of the nature of color.

—A pure blue tending toward cyan blue and of high luminosity; also called Hungary blue, Lethner’s blue, and Paris blue.