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A bath of dilute sulphuric or nitric acid, etc., to remove burnt sand, scale rust, etc., from the surface of castings, or other articles of metal, or to brighten them or improve their color.

change, of colors. Polychromatic acid (Old Chem.), a substance obtained by the action of nitric acid on aloes.

It is deliquescent and cannot be used in gunpowder, but is employed in the production of nitric acid. Called also cubic niter. -- Saltpeter acid (Chem.), nitric acid; -- sometimes so called because made from saltpeter.

nating, a yellow crystalline astringent acid, (NO2)3.C6H.(OH)2, obtained by the action of nitric acid on resorcin. Styphnic acid resembles picric acid, but is not bitter. It acts like a strong dibasic acid, having a series of well defined salts.

sh, produced by the combined action of sulphur dioxide, oxygen (from the air), steam, and nitric fumes. It attacks and dissolves many metals and other intractable substances, sets free most acids from their salts, and is used in the manufacture of hydrochloric and nitric acids, of soda, of bleaching powders, etc. It is…

containing, tantalum; specifically, designating any one of a series of acids analogous to nitric acid and the polyacid compounds of phosphorus.

specifically, designating an acid, C7H10O4, obtained by the oxidation of terbenthene with nitric acid, as a white crystalline substance.

A nitrate formed from three molecules of nitric acid; also, less properly, applied to certain basic nitrates; as, trisnitrate of bismuth.

n plants; -- so called because it leaves a yellow residue when evaporated to dryness with nitric acid. Xanthine is closely related to uric acid.

A yellow acid substance formed by the action of hot nitric acid on albuminous or proteid matter. It is changed to a deep orange- yellow color by the addition of ammonia.

A substance resembling pyroxylin, obtained by the action of nitric acid on starch; -- called also nitramidin.