Difference between revisions of "Sierra Leone copal"
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== Description == | == Description == | ||
| − | + | [[[SliderGallery rightalign|MFA- Copal, Sierra Leone.jpg~FTIR]]] | |
A medium-hard variety of [[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 [[natural%20resin|resin]] that has been used in [[varnish|varnishes]]. | A medium-hard variety of [[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 [[natural%20resin|resin]] that has been used in [[varnish|varnishes]]. | ||
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''Copaifera guibourtiana''; copal de Sierra Leona (Esp.) | ''Copaifera guibourtiana''; copal de Sierra Leona (Esp.) | ||
| − | + | == Risks == | |
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| − | + | * Combustible, burning with a bright flame, dense smoke, and strong smell. | |
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| − | == | + | ==Physical and Chemical 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 C | ||
| − | == | + | ==Resources and Citations== |
| − | * R. J. Gettens, G.L. Stout, ''Painting Materials, A Short Encyclopaedia'', Dover Publications, New York, 1966 Comment: gives trees as Copaifera guibourtiana | + | * 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 | ||
| − | * | + | * "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]] | ||
Latest revision as of 07:32, 31 May 2022
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.)
Risks
- Combustible, burning with a bright flame, dense smoke, and strong smell.
Physical and Chemical 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 C
Resources and Citations
- 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
- "Copal: An Immature and Controversial Resin" at www.emporia.edu/earthsci/amber/copal.htm - gives tree as Copaifera guibourthiana