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An oxychloride of copper, used as a green pigment; also, a carbonate of copper similarly employed.

Cadmium yellow, a compound of cadmium and sulphur, of an intense yellow color, used as a pigment.

proper relation to the opposing point. -- Carbon tissue, paper coated with gelatine and pigment, used in the autotype process of photography. Abney. -- Gas carbon, a compact variety of carbon obtained as an incrustation on the interior of gas retorts, and used for the manufacture of the carbon rods of pencils for th…

ffect of light on bichromatized gelatin. Paper coated with a mixture of the gelatin and a pigment is called carbon paper or carbon tissue. This is exposed under a negative and the film is transferred from the paper to some other support and developed by washing (the unexposed portions being dissolved away). If the proc…

A beautiful pigment, or a lake, of this color, prepared from cochineal, and used in miniature painting.

A brown pigment of varying permanence, consisting of impure lignite. It was found originally near Cassel (now Kassel), Germany.

A brownish purple pigment, obtained by the action of some compounds of tin upon certain salts of gold. It is used in painting and staining porcelain and glass to give a beautiful purple color. Commonly called Purple of Cassius.

A greenish blue pigment prepared in various ways, consisting essentially of cobalt stannate. Unlike other cobalt blues, it does not change color by gaslight.

White lead, used as a pigment. See White lead, under White.

t in sugar refining, and as an absorbent and disinfectant. -- Charcoal blacks, the black pigment, consisting of burnt ivory, bone, cock, peach stones, and other substances. -- Charcoal drawing (Fine Arts), a drawing made with charcoal. See Charcoal, 2. Until within a few years this material has been used almost exclu…

A cutaneous affection characterized by yellow or yellowish brown pigmented spots.

The yellowish green pigment in the inner segment of the cones of the retina. See Chromophane.

ear the cell wall, and consist of a colorless ground substance saturated with chlorophyll pigments. Under light of varying intensity they exhibit phototactic movements. In animals chloroplasts occur only in certain low forms.

A contractile cell or vesicle containing liquid pigment and capable of changing its form or size, thus causing changes of color in the translucent skin of such animals as possess them. They are highly developed and numerous in the cephalopods.

a) The green oxide of chromium, Cr2O3, used in enamel painting, and glass staining. (b) A pigment made by mixing chrome yellow with Prussian blue. -- Chrome red, a beautiful red pigment originally prepared from the basic chromate of lead, but now made from red oxide of lead. -- Chrome yellow, a brilliant yellow pigme…

adily obtained in the free state, but forming well known salts, many of which are colored pigments, as chrome yellow, chrome red, etc. -- Chromic anhydride, a brilliant red crystalline substance, CrO3, regarded as the anhydride of chromic acid. It is one of the most powerful oxidizers known.

An embryonic cell which develops into a pigment cell.

eld in solution by fats, and slowly decolorized by light; distinct from the photochemical pigments of the rods of the retina.

The artificial red sulphide of mercury used as a pigment; vermilion. Cinnabar Græcorum (. Etym: [L. Graecorum, gen. pl., of the Greeks.] (Med.) Same as Dragon's blood. -- Green cinnabar, a green pigment consisting of the oxides of cobalt and zinc subjected to the action of fire. -- Hepatic cinnabar (Min.), an impure…

arsenic used as fly poison. Cobalt bloom. Same as Erythrite. -- Cobalt blue, a dark blue pigment consisting of some salt of cobalt, as the phosphate, ignited with alumina; -- called also cobalt ultramarine, and Thenard's blue. -- Cobalt crust, earthy arseniate of cobalt. -- Cobalt glance. (Min.) See Cobaltite. -- C…