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ubstance, CrO3, regarded as the anhydride of chromic acid. It is one of the most powerful oxidizers known.

A black submetallic mineral consisting of oxide of chromium and iron; -- called also chromic iron.

ks.] (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 cinnabar of a liver-brown color and submetallic luster.

composition, in part, of rocks containing aluminous minerals, as granite. Lime, magnesia, oxide of iron, and other ingredients, are often present as impurities.

A scale of oxide of iron, formed in forging.

t glance. (Min.) See Cobaltite. -- Cobalt green, a pigment consisting 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.

t; -- said especially of those compounds in which cobalt has higher valence; 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. Modi…

Polishing rouge; a reddish brown oxide of iron, used in polishing glass, and also as a pigment; -- called also crocus Martis.

um or niobium; niobic. Columbic acid (Chem.), a weak acid derived from columbic or niobic oxide, Nb2O5; -- called also niobic acid.

ing ink, in dyeing black, as a tonic in medicine, etc. It is made on a large scale by the oxidation of iron pyrites. Called also ferrous sulphate.

) A scum of calcium carbonate which forms on a solution of milk of lime from the carbon dioxide of the air. (b) A thick creamy emulsion of lime in water. -- Cream of tartar (Chem.), purified tartar or argol; so called because of the crust of crystals which forms on the surface of the liquor in the process of purificat…

o blue asbestus. A silicified form, in which the fibers penetrating quartz are changed to oxide of iron, is the yellow brown tiger-eye of the jewelers.

A deep yellow powder; the oxide of some metal calcined to a red or deep yellow color; esp., the oxide of iron (Crocus of Mars or colcothar) thus produced from salts of irron, and used as a polishing powder. Crocus of Venus (Old Chem.), oxide of copper.

The red oxide of copper; red copper; an important ore of copper, occurring massive and in isometric crystals.

ane covering the aerial organs of plants, and forming an essential ingredient of cork; by oxidation it passes to suberic acid.

A semisolid emulsion produced by the treatment of certain skins with oxidized fish oil, which extracts their soluble albuminoids. It was formerly solely a by-product of chamois leather manufacture, but is now made for its own sake, being valuable as a dressing for hides.

e branching figures resembling shrubs or trees, produced by a foreign mineral, usually an oxide of manganese, as in the moss agate; also, a crystallized mineral having an arborescent form, e. g., gold or silver; an arborization.

To deoxidize. [Obs.]

To deoxidize.

dextrose; as, dextronic acid. Dextronic acid, a sirupy substance obtained by the partial oxidation of various carbohydrates, as dextrose, etc.