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, and is used as a substitute for borax as a blowpipe reagent in testing for the metallic oxides. Originally obtained by the alchemists from human urine, and called sal microcosmicum.

A heavy, brilliant red pigment, consisting of an oxide of lead, Pb3O4, obtained by exposing lead or massicot to a gentle and continued heat in the air. It is used as a cement, as a paint, and in the manufacture of flint glass. Called also red lead.

A pigment of a green color, the chief constituent of which is oxide of chromium.

ch the element has a higher valence, as contrasted with molybdous compounds; as, molybdic oxide.

nd contains one atom, radical, or group of that to the name of which it is united; as, monoxide, monosulphide, monatomic, etc.

A sulphide containing one atom of sulphur, and analogous to a monoxide; -- contrasted with a Ant: polysulphide; as, galena is a monosulphide.

st, as a liquid, with a solution of mercuric iodide in potassium iodide and potassium hydroxide, which is called Nessler's solution or Nessler's test, and is used to detect the presence of ammonia.

nally obtained from bile. Chemically, however, choline is oxyethyl-trimethyl-ammonium hydroxide, while neurine is vinyl-trimethyl-ammonium hydroxide. [Written also neurin.]

, as contrasted with the nickelous compounds, the metal has a higher valence; as nickelic oxide.

, as contrasted with the nickelic compounds, the metal has a lower valence; as, nickelous oxide. Frankland.

Nothing. Nihil album Etym: [L., white nothing] (Chem.), oxide of zinc. See under Zinc. -- Nihil debet Etym: [L., he owes nothing] (Law), the general issue in certain actions of debt. -- Nihil dicit Etym: [L., he says nothing] (Law), a declinature by the defendant to plead or answer. Tomlins.

which, as contrasted with nitrous compounds, the element has a higher valence; as, nitric oxide; nitric acid. Nitric acid, a colorless or yellowish liquid obtained by distilling a nitrate with sulphuric acid. It is powerfully corrosive, being a strong acid, and in decomposition a strong oxidizer. -- Nitric anhydride,…

the free state, but forming a well known series of salts, viz., the nitrites. -- Nitrous oxide. See Laughing gas.

olored rings formed upon a metal plate by the electrolytic disposition of copper, lead peroxide, etc. They may be produced by touching with a pointed zinc rod a silver plate on which is a solution of copper sulphate.

A metallic oxide occurring in earthy form; as, tungstic ocher or tungstite.

Titanium dioxide occurring in acute octahedral crystals.

those compounds in which it has a valence higher than in other lower compounds; as, osmic oxide. Osmic acid. (Chem.) (a) Osmic tetroxide. [Obs.] (b) Osmic acid proper, an acid analogous to sulphuric acid, not known in the free state, but forming a well-known and stable series of salts (osmates), which were formerly imp…

hard, infusible, bluish or grayish white metal, and the heaviest substance known. Its tetroxide is used in histological experiments to stain tissues. Symbol Os. Atomic weight 191.1. Specific gravity 22.477.

See Oxide.

Capability of being converted into an oxide.