Copal

Title: Copal
CAS Registry Number: 9000-14-0
Additional Names: Resin copal; gum copal; anime (soft copal); kaurie; cowrie
Literature References: A resin found as a fossil in Zaire, or exuding from various species of Trachylobium, Hymenaea courbaril L., etc., Leguminosae. Occurs as hard or soft copals. Habit. Zanzibar, Mozambique, also S. America, Australia, Philippine Islands and West Indies. Constit. Zanzibar copal contains 80% trachylolic acid, 4% isotrachylolic acid, 6% resene and volatile oil. Kaurie copal contains dammaric acid, dammaran and a resin.
Properties: Yellowish to yellowish-brown pieces of various sizes; conchoidal fracture; odorless and tasteless. Hard copals are almost insol in usual solvents; soft copals are partly sol in alcohol, chloroform or glacial acetic acid; both copals after having been fused are sol in oil turpentine and linseed oil.
Use: In varnishes and cements; as substitute for amber; manuf oil cloths and linoleum. In dentistry, for modeling compds and cavity varnishes.
Coparaffinate Copper Phthalocyanine Copper(I) Thiophene-2-carboxylate Coproergostane Coprogen

Copal from Madagascar with spiders, termites, ants, elateridae, hymenoptera, cockroach and a flower
A sample of copal containing a few termites

Copal is a name given to tree resin that is particularly identified with the aromatic resins used by the cultures of pre-Columbian Mesoamerica as ceremonially burned incense and other purposes.[1] More generally, the term copal describes resinous substances in an intermediate stage of polymerization and hardening between "gummier" resins and amber.[2] The word copal is derived from the Nahuatl language word copalli, meaning "incense".[3][4][5][7][6]

To the pre-Columbian Maya and contemporary Maya peoples it is known in the various Mayan languages as pom (or a close variation thereof),[3][8] although the word itself has been demonstrated to be a loanword to Mayan from Mixe–Zoquean languages.[citation needed]

Copal is still used by a number of indigenous peoples of Mexico and Central America as an incense and during sweat lodge ceremonies.[9] It is available in different forms. The hard, amber-like yellow copal is a less expensive version. The white copal, a hard, milky, sticky substance, is a more expensive version of the same resin.

Copal was also found in East Africa (the common species there being Hymenaea verrucosa), initially feeding an Indian Ocean demand for incense. By the 18th century, Europeans found it to be a valuable ingredient in making a good wood varnish. It became widely used in the manufacture of furniture and carriages. It was also sometimes used as a picture varnish.[10] By the late 19th and early 20th century varnish manufacturers in England and America were using it on train carriages, greatly swelling its demand.

In 1859 Americans consumed 68 percent of the East African trade, which was controlled through the Sultan of Zanzibar, with Germany receiving 24 percent. The American Civil War and the creation of the Suez Canal led to Germany, India and Hong Kong taking the majority by the end of that century.[11]

East Africa apparently had a higher amount of subfossil copal, which is found one or two meters below living copal trees from roots of trees that may have lived thousands of years earlier. This subfossil copal produces a harder varnish. Subfossil copal is also well-known from New Zealand (Kauri gum), Japan, the Dominican Republic, Colombia and Madagascar. It often has inclusions and is sometimes sold as "young amber". Copal can be easily distinguished from genuine amber by its lighter citrine colour and its surface getting tacky with a drop of acetone or chloroform.[12]