BLUDOFF, DIMITRI NIRIOLAYEVITCH Count (1785-1864). A Russian statesman, born in the Government of Vladimir. studied in Moscow, entered the diplomat ic service, was ap pointed Secretary of State under Nicholas I., and in 1832 became Secretary of the Interior. Ile worked unceasingly for the welfare of the peas ants. As Minister of Justice lie obtained two ukases (1842. 1847) for the amelioration of the eondition of the serfs, and as president of the Imperial Council and of the Council of Ministers lie set his signature to the aet abolishing serf dom. For his biography, consult Kovalevski (Saint Petersburg, 1866).
BLUE (from Fr. blcu, in itself borrowed from the Germanic nations: 011G. bbio, AS. blow, Ger. Hau). A primary color of the seine shade as the clear sky and the turquoise, and located in the solar spectrum after the green and be fore the violet. This color has been conspicu ously used as a badge to designate military bodies. It was the favorite color of the Scottish Covenanters in the Seventeenth Century. when it was called 'true blue,' and is the color commonly worn by the soldiers of the United States Army. The sailors of most navies are dressed in uniforms of a darker color, called nary blue. Among blue minerals, the sapphire and the turquoise are highly valued as gems; the lapis-lazuli has been extensively used for orna mental purposes. The coloring matter of blue flowers is due to a pigment called anthocynniu. Among the more important blue pigments are the following: Antwerp blue, a mixture of Prus sian blue and alumina ; azure blue, a cobalt oxide fused with glass and ground to powder; Berlin blue, another name for both Antwerp blue and Prussian blue; bite blue, originally native azurite powdered and washed, more com monly. however, a preparation of smelt; Bremen blue, chalk or whiting mixed with a solution of copper in nitric acid; China blue, crude cobalt oxide ground with potash and mixed with feld spar, fused, and powdered; cobalt blue, 10 parts of aluminum mixed with 1 part of a cobalt salt.
slowly dried, and heated to a dull redness and ground to powder; king's blue, a cobalt car bonate; mountain blue, native copper carbonate or azurite: mineral blue, a synonym for Ant werp blue; Paris blue, a synonym for both cobalt blue and Prussian blue; Prussian blue is iron ferrocyanide made by adding potassium ferro cyanide to a solution of ferrous sulphate. and the resulting precipitate washed and dried; queen blue, a synonym for lump blue used in laun dries (bluing) ; Saunders blue, ultramarine ashes obtained from the resinous mass in making ultramarine; Saxon(y) blue, Prussian blue and aluminum hydrate; small, a cobalt ore heated with Clint and potash, and ground to a pow der; Thenard blue, a synonym for cobalt blue: ultramarine, originally prepared from lapis lazuli, but now made synthetically by heating together kaolin, sodium sulphate, sodium car bonate, sulphur, and charcoal, then pulverizing. washing. and drying. Among the dyestuffs that yield a blue color are the following, the origin of many of which is indicated by their names: Alizarin blue; aniline blue; anthraerne blue; ehemir blue, a solution of indigo; Coup ier's blue, derived from induline; dahlia blue, derived from rosaniline; ethylene blue, derived from diethylaniline; indigo blue, originally de rived from the indigo plant and now made synthetically; loywocd blue, an extract of log wood ; methylene blue, derived from methylani line; night blue, derived from roseniline; resor eine blue, derived from phenol; soluble blue, de rived from rOsaniline; and Victoria blue, derived from rosaniline.
Blue Stone, or Blue Vitriol, is the commercial name for copper sulphate.