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A small tile of glass, marble, or other substance, of various colors, used in making ornamental patterns in mosaic pavements. Fairholt.

nd marginal rays; and chromatic aberration, when due to different refrangibilities of the colored rays of the spectrum, those of each color having a distinct focus.

orbent ground (Paint.), a ground prepared for a picture, chiefly with distemper, or water colors, by which the oil is absorbed, and a brilliancy is imparted to the colors.

which naturally accompany it; as the solidity of marble when contemplated apart from its color or figure. -- Abstract terms, those which express abstract ideas, as beauty, whiteness, roundness, without regarding any object in which they exist; or abstract terms are the names of orders, genera or species of things, in…

d to others; analysis. Thus, when the mind considers the form of a tree by itself, or the color of the leaves as separate from their size or figure, the act is called abstraction. So, also, when it considers whiteness, softness, virtue, existence, as separate from any particular objects.

.), those which contain one or more tones foreign to their proper harmony. -- Accidental colors (Opt.), colors depending on the hypersensibility of the retina of the eye for complementary colors. They are purely subjective sensations of color which often result from the contemplation of actually colored bodies. -- Ac…

A limpid, colorless, inflammable liquid from the slow oxidation of alcohol under the influence of platinum black.

and hydrogen, in the proportion of two atoms of the former to two of the latter. It is a colorless gas, with a peculiar, unpleasant odor, and is produced for use as an illuminating gas in a number of ways, but chiefly by the action of water on calcium carbide. Its light is very brilliant. Watts.

Seeds of the annotto tree; also, the coloring matter, annotto.

Free from color; transmitting light without decomposing it into its primary colors.

To deprive of color; to make achromatic.

Color blindness; inability to distinguish colors; Daltonism.

Lacking, or deficient in, color; as, achromatous blood.

Free from color; colorless; as, in Physiol. Chem., the achromic point of a starch solution acted upon by an amylolytic enzyme is the point at which it fails to give any color with iodine.

Dextrin not colorable by iodine. See Dextrin.

Colorless; achromatic.

ished by their sour taste, solubility in water, and reddening of vegetable blue or violet colors. They are also characterized by the power of destroying the distinctive properties of alkalies or bases, combining with them to form salts, at the same time losing their own peculiar properties. They all contain hydrogen, u…

Color blindness; achromatopsy.

A limpid, colorless, highly volatile liquid, obtained by the dehydration of glycerin, or the destructive distillation of neutral fats containing glycerin. Its vapors are intensely irritating. Watts.

mal of the class Anthozoa, and family Actinidæ. From a resemblance to flowers in form and color, they are often called animal flowers and sea anemones. [See Polyp.].