Gelatin

* Both spellings, gelatin and gelatine, are in good use, but the tendency of writers on physiological chemistry favors the form in -in, as in the United States Dispensatory, the United States Pharmacopœia, Fownes' Watts' Chemistry, Brande *** Cox's Dictionary.

Blasting gelatin, an explosive, containing about ninety-five parts of nitroglycerin and five of collodion. -- Gelatin process, a name applied to a number of processes in the arts, involving the use of gelatin. Especially: (a) (Photog.) A dry-plate process in which gelatin is used as a substitute for collodion as the sensitized material. This is the dry-plate process in general use, and plates of extreme sensitiveness are produced by it. (b) (Print.) A method of producing photographic copies of drawings, engravings, printed pages, etc., and also of photographic pictures, which can be printed from in a press with ink, or (in some applications of the process) which can be used as the molds of stereotype or electrotype plates. (c) (Print. or Copying) A method of producing facsimile copies of an original, written or drawn in aniline ink upon paper, thence transferred to a cake of gelatin softened with glycerin, from which impressions are taken upon ordinary paper. -- Vegetable gelatin. See Gliadin.