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c., and reduced as a heavy, hard, nickel-white metal which is quite permanent. Its yellow oxide is used to impart to glass a delicate greenish-yellow tint which is accompanied by a strong fluorescence, and its black oxide is used as a pigment in porcelain painting. Symbol U. Atomic weight 239.

ectively) from uranium; -- used in naming certain complex compounds; as in uranoso-uranic oxide, uranoso-uranic sulphate.

rythrin, etc., present in the urine together with indican, a colorless substance which by oxidation is convertible into colored bodies.

, occasionally found in the urine in degeneration of the kidneys. It is readily formed by oxidation or decomposition of indican.

ting, an acid, C5H8N4O6, which is obtained, as a white crystalline substance, by the slow oxidation of uric acid in alkaline solution.

Indigo red, a product of the decomposition, or oxidation, of indican. It is sometimes found in the sediment of pathological urines. It is soluble in ether or alcohol, giving the solution a beautiful red color. Also called indigrubin.

nating, an acid, CH3C6H3(CO2H)2, obtained as a white crystalline substance by the partial oxidation of mesitylene; -- called also mesitic acid.

americ variety which turns the plane of polarization to the right, although formed by the oxidation of a levorotatory amyl alcohol.

m has a relatively higher valence as contrasted with the vanadious compounds; as, vanadic oxide. Vanadic acid (Chem.), an acid analogous to phosphoric acid, not known in the free state but forming a well-known series of salts.

ted from vanilla pods, and is also obtained by the decomposition of coniferin, and by the oxidation of eugenol.

rom molten zinc in a separate receptacle, using hydrogen or other reducing gas to prevent oxidation.

reservative, and obtained by the spontaneous (acetous) fermentation, or by the artificial oxidation, of wine, cider, beer, or the like.

n dyeing. It is usually obtained by dissolving zinc in sulphuric acid, or by roasting and oxidizing certain zinc ores. Formerly called also vitriol of zinc.

To bring back a metal to the metallic form, as from an oxide or solution; to reduce. [Obs.]

An earthy oxide of manganese, or mixture of different oxides and water, with some oxide of iron, and often silica, alumina, lime, or baryta; black ocher. There are several varieties.

A process for the recovery or regeneration of manganese dioxide in the manufacture of chlorine, by means of milk of lime and the oxygen of the air; -- so called after the inventor.

99 : 1), drying, and, for use, igniting to burn the thread and convert the nitrates into oxides, which remain as a fragile ash. The light far exceeds that obtained from the same amount of gas with the ordinary fishtail burner, but has a slight greenish hue.

a carcass. -- Mineral wool. See under Mineral. -- Philosopher's wool. (Chem.) See Zinc oxide, under Zinc. -- Pulled wool, wool pulled from a pelt, or undressed hide. -- Slag wool. Same as Mineral wool, under Mineral. -- Wool ball, a ball or mass of wool. -- Wool burler, one who removes little burs, knots, or ext…

enic acid, obtained as a white crystalline substance by the action of sodium and carbon dioxide on crude xylenol.

ene; specifically, designating any one of several metameric acids produced by the partial oxidation of mesitylene and pseudo-cumene.