Difference between revisions of "Sierra Leone copal"
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== Description == | == Description == | ||
| − | A medium-hard variety of [http://cameo.mfa.org/materials/fullrecord.asp?name=copal copal] resin obtained from the ''Copaifera guibourtiana'' tree native to the British colony of Sierra Leone in Africa. Sierra Leone copal is a pale yellow uniform [http://cameo.mfa.org/materials/fullrecord.asp?name=natural | + | A medium-hard variety of [http://cameo.mfa.org/materials/fullrecord.asp?name=copal copal] resin obtained from the ''Copaifera guibourtiana'' tree native to the British colony of Sierra Leone in Africa. Sierra Leone copal is a pale yellow uniform [http://cameo.mfa.org/materials/fullrecord.asp?name=natural%20resin resin] that has been used in [http://cameo.mfa.org/materials/fullrecord.asp?name=varnish varnishes]. |
== Synonyms and Related Terms == | == Synonyms and Related Terms == | ||
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== Authority == | == Authority == | ||
| − | * | + | * R. J. Gettens, G.L. Stout, ''Painting Materials, A Short Encyclopaedia'', Dover Publications, New York, 1966 Comment: gives trees as Copaifera guibourtiana |
* Art and Architecture Thesaurus Online, http://www.getty.edu/research/tools/vocabulary/aat/, J. Paul Getty Trust, Los Angeles, 2000 | * Art and Architecture Thesaurus Online, http://www.getty.edu/research/tools/vocabulary/aat/, J. Paul Getty Trust, Los Angeles, 2000 | ||
| − | * | + | * Website address 1 Comment: "Copal: An Immature and Controversial Resin" at www.emporia.edu/earthsci/amber/copal.htm - gives tree as Copaifera guibourthiana |
[[Category:Materials database]] | [[Category:Materials database]] | ||
Revision as of 06:47, 24 July 2013
Description
A medium-hard variety of copal resin obtained from the Copaifera guibourtiana tree native to the British colony of Sierra Leone in Africa. Sierra Leone copal is a pale yellow uniform resin that has been used in varnishes.
Synonyms and Related Terms
Copaifera guibourtiana; copal de Sierra Leona (Esp.)
Other Properties
Slightly soluble in acetone, amyl alcohol, ethanol, benzene, ether, turpentine. Saponification number = 146-150; Acid number = 109-114. Most copals fluoresce white under short-wave UV light.
| Melting Point | 130-200 |
|---|
Hazards and Safety
Combustible, burning with a bright flame, dense smoke, and strong smell.
Authority
- R. J. Gettens, G.L. Stout, Painting Materials, A Short Encyclopaedia, Dover Publications, New York, 1966 Comment: gives trees as Copaifera guibourtiana
- Art and Architecture Thesaurus Online, http://www.getty.edu/research/tools/vocabulary/aat/, J. Paul Getty Trust, Los Angeles, 2000
- Website address 1 Comment: "Copal: An Immature and Controversial Resin" at www.emporia.edu/earthsci/amber/copal.htm - gives tree as Copaifera guibourthiana