Online Encyclopedia

Search over 40,000 articles from the original, classic Encyclopedia Britannica, 11th Edition.

COPAL (Mexican copalli, incense)

Online Encyclopedia
Originally appearing in Volume V07, Page 94 of the 1911 Encyclopedia Britannica.
Spread the word: del.icio.us del.icio.us it!

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, 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 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 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 .

End of Article: COPAL (Mexican copalli, incense)
[back]
COPAIBA, or COPAIVA (from Brazilian cupauba)
[next]
COPALITE, or COPALINE

Additional information and Comments

There are no comments yet for this article.
» Add information or comments to this article.
Please link directly to this article:
Highlight the code below, right click and select "copy." Paste it into a website, email, or other HTML document.