See also:COPAL (Mexican copalli, See also:incense)
, a hard lustrous See also:resin, varying in See also:hue from an almost colourless transparent See also:mass to a See also:bright yellowish-See also:- BROWN
- BROWN, CHARLES BROCKDEN (1771-181o)
- BROWN, FORD MADOX (1821-1893)
- BROWN, FRANCIS (1849- )
- BROWN, GEORGE (1818-188o)
- BROWN, HENRY KIRKE (1814-1886)
- BROWN, JACOB (1775–1828)
- BROWN, JOHN (1715–1766)
- BROWN, JOHN (1722-1787)
- BROWN, JOHN (1735–1788)
- BROWN, JOHN (1784–1858)
- BROWN, JOHN (1800-1859)
- BROWN, JOHN (1810—1882)
- BROWN, JOHN GEORGE (1831— )
- BROWN, ROBERT (1773-1858)
- BROWN, SAMUEL MORISON (1817—1856)
- BROWN, SIR GEORGE (1790-1865)
- BROWN, SIR JOHN (1816-1896)
- BROWN, SIR WILLIAM, BART
- BROWN, THOMAS (1663-1704)
- BROWN, THOMAS (1778-1820)
- BROWN, THOMAS EDWARD (1830-1897)
- BROWN, WILLIAM LAURENCE (1755–1830)
brown, having a conchoidal fracture, and, when dissolved in See also:alcohol, spirit of See also:turpentine, or any other suitable menstruum, forming one of the most valuable varnishes
.
See also:Copal is obtained from a variety of See also:sources; the See also:term is not uniformly applied or restricted to the products of any particular region or See also:series of See also:plants, but is vaguely used for resins which, though very similar in their See also:physical properties, differ somewhat in their constitution, and are altogether distinct as to their source
.
Thus the resin obtained from Trachylobium Hornemannianum is known in See also:commerce as See also:Zanzibar copal, or See also:- GUM (Fr. gomme, Lat. gommi, Gr. Kµµ1, possibly a Coptic word; distinguish " gum," the fleshy covering of the base of a tooth, in O. Eng. gbma, palate, cf. Ger. Gaumen, roof of the mouth; the ultimate origin is probably the root gha, to open wide, seen in
gum See also:anime
.
See also:Madagascar copal is the produce of T. verrucosum
.
From Guibourtia copallifera is obtained Sierra Leone copal, and another variety of the same resin is found in a fossil See also:state on the See also:west See also:coast of See also:Africa, probably the produce of a See also:- TREE (0. Eng. treo, treow, cf. Dan. tree, Swed. Odd, tree, trd, timber; allied forms are found in Russ. drevo, Gr. opus, oak, and 36pv, spear, Welsh derw, Irish darog, oak, and Skr. dare, wood)
- TREE, SIR HERBERT BEERBOHM (1853- )
tree now See also:extinct
.
From See also:Brazil and other See also:South See also:American countries, again, copal is obtained which is yielded by T r achylobium Martianum, Hymenaea Courbaril, and various other See also:species, while the See also:dammar resins and the piney See also:varnish of See also:India are occasionally classed and spoken of as copal
.
Of the varieties above enumerated by far the most important from a commercial point of view is the Zanzibar or See also:East See also:African copal, yielded by Trachylobium Hornemannianum
.
The resin is found in two distinct conditions: (I) raw or See also:recent, called by the inhabitants of the coast sandarusiza miti or chakazi, the latter name being corrupted by Zanzibar traders into " jackass " copal; and (2) ripe or true copal, the sandarusi inti of the natives
.
The raw copal, which is obtained See also:direct from the trees, or found at their roots or near the See also:surface of the ground, is not regarded by the natives as of much value, and does not enter into See also:European commerce
.
It is sent to India and See also:China, where it is manufactured into a coarse See also:kind of varnish
.
The true or fossil copal is found embedded in the See also:earth over a wide See also:belt of the mainland coast of Zanzibar, on tracts where not a single tree is now visible
.
The copal is not found at a greater See also:depth in the ground than 4 ft., and it is seldom the diggers go deeper than about 3 ft
.
It occurs in pieces varying from the See also:size of small pebbles up to masses of several ounces in See also:weight, and occasionally lumps weighing 4 or 5 lb have been obtained
.
After being freed from See also:foreign See also:matter, the resin is submitted to various chemical operations for the purpose of clearing the " See also:goose-skin," the name given to the See also:peculiar pitted-like surface possessed by fossil copal
.
The goose-skin was formerly supposed to be caused by the impression of the small stones and See also:sand of the See also:soil into which the soft resin See also:fell in its raw See also:condition; but it appears that the copal when first dug up presents no trace of the goose-skin, the subsequent See also:appearance of which is due to oxidation or inter-molecular See also:change
.
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