PITCH

n. Pi"ch. A.-S.,pic. Gr., iriTTa. Lat., pix. FT., poix, goudron. Ger., Pech. The substance left behind in the distillation of tar. It is a shiny, black, solid substance which, on the application of moderate heat, becomes viscous and adhesive. It consists of fixed resin and volatile resinous principles. It was formerly official in the Br. Ph. as pix (pix nigra or pix arid a). [B, 5.] Artificial Burgundy p. A factitious product, devoid of the fragrance of Burgundy p., made by melting together p., rosin, and turpentine, or rosin and palm-oil or some other fat, and agitating the mixture with water to give it the nece ary opaquene . According to Hanbury, if treated with twice its weight of glacial acetic acid, it forms a turbid mixture, instead of di olving like Burgundy p., and the oil soon forms a distinct layer above the other constituents. [B, 5, 18 (a, 35).] Cf. Poix blanche (2d def.). Black p. Lat., pix nigra [Belg. Ph., Gr. Ph.] (seu sicca, seu solid a [Netherl. Ph., Ru . Ph.], seu nayalis [Ger. Ph., 1st ed.]). FK., poix noire (ou navale). Ger., Schiffspech, Schusterpech, schwarzes Pech. See P. [B, 18 (a, 35).] Burgundy p. Lat., pix burgundica [U. S. Ph., Br. Ph., Belg. Ph., Swi Ph., Hung. Ph. (2d ed.)] (seu abietina). Fr., poix blanche (ou de Bourgogne, ou des Vosges, ou gra e, ou jaune [Fr. Cod.]). Ger., Fichtenharz, Tannenharz, burgundisches Pech. Sp., pez de Borgona [Mex. Ph.]. Of the U. S. Ph. and Br. Ph., the prepared resin of Abies excels a. In commerce the term includes the prepared turpentines of various other coniferous trees. When pure, it is a somewhat opaque, yellowish brown, aromatic, strongly adhesive substance, differing from turpentine chiefly in its smaller proportion of volatile oil. It is very soluble in glacial acetic acid, in water, in absolute alcohol, and even in 75-per-cent. alcohol, but considerably le soluble when it contains water and e ential oil. It breaks with a clear conchoidal fracture, and when cold is brittle and hard, yet eventually a umes the form of the ve el in which it is kept. It is used in the form of plaster as a mild rubefacient. [B, 5, 18 (a. 35); " Proc. of the Am. Pharm. A oc.," xxvi, p. 324 (a, 50).] Burgundy p. plaster. See Emplastrum PICIS (under Pix). Canada p. Lat., pix can a dens is [U. S. Ph.]. Hemlock p., the prepared resin of Abies can a dens is; a hard, brittle, reddish-brown, opaque, nearly tastele substance of a weak peculiar odor. It contains but a minute percentage of volatile oil. It is used like Burgundy p., but softens at a much lower temperature. [B, 5 to, 35).] Canada p. plaster, Hemlock p. plaster. See Emplastrum PICIS can a dens is (under Pix). Irritant p. plaster. See Emplastrum PICIS irritans (under Fix). Jew's p., Mineral p. See ASPHALT. P. plaster. See Emplastrum PICIS (under PIX). Yellow p. Galipot or barras purified by melting and straining. [B, 180 (a, 35).] [s. 279]