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, 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 pigment, PbCrO4, used by painters.…

e 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.

A general name for the several coloring matters, red, green, yellow, etc., present in the inner segments in the cones of the retina, held in solution by fats, and slowly decolorized by light; distinct from the photochemical pigments of the rods of the retina.

A yellow substance obtained as a by-product in the manufacture of rosaniline. It dyes silk a fine golden-yellow color.

A bitter, yellow substance forming the essential constituent of Goa powder, and yielding chrysophanic acid proper; hence formerly called also chrysphanic acid.

a white crystalline substance, C18H12, of strong blue fluorescence, but generally colored yellow by impurities.

A mineral, found in crystals, of a yellow to green or brown color, and consisting of aluminia and glucina. It is very hard, and is often used as a gem.

A yellow crystalline substance extracted from crude anthracene.

An artificial, yellow, crystalline dye, C6H5N2.C6H3(NH2)2. Also, one of a group of dyestuffs resembling chrysoïdine proper.

A mineral, composed of silica, magnesia, and iron, of a yellow to green color. It is common in certain volcanic rocks; -- called also olivine and peridot. Sometimes used as a gem. The name was also early used for yellow varieties of tourmaline and topaz.

A glucoside extracted from rhubarb as a bitter, yellow, crystalline powder, and yielding chrysophanic acid on decomposition.

Pertaining to, or derived from, or resembling, chrysophane. Chrysophanic acid (Chem.), a yellow crystalline substance extracted from rhubarb, yellow dock, sienna, chrysarobin, etc., and shown to be a derivative of an anthracene. It is used in the treatment of skin diseases; -- called also rhein, rheic acid, rhubarbarin…

A yellow crystalline substance, (C6H5.C2H2)2CO, the ketone of cinnamic acid.

hemy, the state of perfection in the philosopher's stone indicated by its assuming a deep yellow color. Thynne.

Like a citron or lemon; of a lemon color; greenish yellow. Citrine ointment (Med.), a yellowish mercurial ointment, the unquentum hydrargyri nitratis.

honey, taken from glands in the anal pouch of the civet (Viverra civetta). It is of clear yellowish or brownish color, of a strong, musky odor, offensive when undiluted, but agreeble when a small portion is mixed with another substance. It is used as a perfume.

h (Zoöl.), a small moth of the genus Tinea. The most common species (T. flavifrontella)is yellowish white. The larvæ eat woolen goods, furs, feathers, etc. They live in tubular cases made of the material upon which they feed, fastened together with silk.

g essentially of the oxides of cobalt and zinc; -- called also Rinman's green. -- Cobalt yellow (Chem.), a yellow crystalline powder, regarded as a double nitrite of cobalt and potassium.

nce; as, cobaltic oxide. Luteo-cobaltic compounds (Chem.), an extensive series of complex yellow compounds of ammonia and cobaltic salts. -- Roseo-cobaltic compounds (Chem.), an extensive series of complex red compounds of cobalt and ammonia. Modifications of these are the purpureo-cobaltic compounds.…

loid, C17H19NO5, extracted from the Colchicum autumnale, or meadow saffron, as a white or yellowish amorphous powder, with a harsh, bitter taste; -- called also colchicia.