Difference between revisions of "Gamboge"
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== Description == | == Description == | ||
[[File:296 gamboge.jpg|thumb|Gamboge, powdered]] | [[File:296 gamboge.jpg|thumb|Gamboge, powdered]] | ||
| − | A yellow-orange gum-resin produced by several species of ''Garcinia'' tree found in India, Thailand, Cambodia, Vietnam, and Ceylon. Gamboge was used as a yellow pigment as early as the 8th century in Asia and Japan. It was regularly imported to Europe in the 17th century but a few earlier deliveries may have occurred. Gamboge is composed of a yellow resinous component (70-80%; morelloflavone) and a clear water-soluble [[gum]] (20%). Gamboge is marketed in the form of dull, brownish-yellow cakes or lumps. When powdered, it has a rich golden color. Gamboge is used as a transparent colorant in glazes, varnishes, and watercolors. The carbohydrate gum acts as a natural binder. The yellow color fades when exposed to light or [[ozone]]. In some cases it has recovered its color when placed in the dark. | + | A yellow-orange gum-resin produced by several species of ''Garcinia'' tree found in India, Thailand, Cambodia, Vietnam, and Ceylon. Gamboge was used as a yellow pigment as early as the 8th century in Asia and Japan. It was regularly imported to Europe in the 17th century but a few earlier deliveries may have occurred. Gamboge is composed of a yellow resinous component (70-80%; morelloflavone) and a clear water-soluble [[gum]] (20%). Gamboge is marketed in the form of dull, brownish-yellow cakes or lumps. When powdered, it has a rich golden color. Gamboge is used as a transparent colorant in dyes, glazes, varnishes, and watercolors. The carbohydrate gum acts as a natural binder. The yellow color fades when exposed to light or [[ozone]]. In some cases it has recovered its color when placed in the dark. |
| − | + | * See also [[https://cameo.mfa.org/wiki/Category:Uemura_dye_archive '''Uemera Dye Archive''' (Touou/Kusashio)]] | |
| + | [[[SliderGallery rightalign|Gamboge 297.TIF~FTIR (MFA)|GambogeUCL.jpg~Raman (UCL)|Gamboge color.PNG~EEM Color|Gamboge line.PNG~EEM Line|f296sem.jpg~SEM|f296edsbw.jpg~EDS|Slide 9 FC296.PNG~XRF]]] | ||
== Synonyms and Related Terms == | == Synonyms and Related Terms == | ||
''Garcinia'' sp.; Natural Yellow 24; gomaguta (Esp., Port.); Gummigutt (Deut.); gomme-gutte (Fr.); gomma gutta (It.); giallo Cambogia (It.); gamboji (Jap.); shio (Jap.); kiyo (Jap.); gamboge (Ned., Port.); camboge; cambogia; gum gutta; gutto gumbo; guti ambar; gambogium; rattan yellow; wisteria yellow; gummi-gutti; Siam gamboge; Ceylon gamboge; gokatu gamboge | ''Garcinia'' sp.; Natural Yellow 24; gomaguta (Esp., Port.); Gummigutt (Deut.); gomme-gutte (Fr.); gomma gutta (It.); giallo Cambogia (It.); gamboji (Jap.); shio (Jap.); kiyo (Jap.); gamboge (Ned., Port.); camboge; cambogia; gum gutta; gutto gumbo; guti ambar; gambogium; rattan yellow; wisteria yellow; gummi-gutti; Siam gamboge; Ceylon gamboge; gokatu gamboge | ||
| − | + | == Risks == | |
| + | * Discolors to red with ammonia and other alkali. | ||
| + | * Fades in sunlight or ozone. | ||
| + | * Toxic by ingestion. | ||
== Physical and Chemical Properties == | == Physical and Chemical Properties == | ||
| − | Yellow resinous portion is soluble in ethanol. Colorless carbohydrate portion is soluble in water. Burns with an odor of resin. Turns red in dilute alkali solutions. | + | * Yellow resinous portion is soluble in ethanol. |
| − | + | * Colorless carbohydrate portion is soluble in water. | |
| − | The small amorphous particles are transparent in transmitted light. | + | * Burns with an odor of resin. |
| − | + | * Turns red in dilute alkali solutions. | |
| + | * The small amorphous particles are transparent in transmitted light. | ||
* ISO R105 Lightfastness Classification = 2-3 | * ISO R105 Lightfastness Classification = 2-3 | ||
* Density = 1.2 | * Density = 1.2 | ||
* Refractive Index = 1.582-1.586 | * Refractive Index = 1.582-1.586 | ||
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== Additional Images == | == Additional Images == | ||
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</gallery> | </gallery> | ||
| − | == | + | ==Resources and Citations== |
* J.Winter, "Gamboge", ''Artists Pigments'', Volume 3, E. West FitzHugh (ed.), Oxford University Press: Oxford, 1997. | * J.Winter, "Gamboge", ''Artists Pigments'', Volume 3, E. West FitzHugh (ed.), Oxford University Press: Oxford, 1997. | ||
Latest revision as of 11:52, 25 July 2022
Description
A yellow-orange gum-resin produced by several species of Garcinia tree found in India, Thailand, Cambodia, Vietnam, and Ceylon. Gamboge was used as a yellow pigment as early as the 8th century in Asia and Japan. It was regularly imported to Europe in the 17th century but a few earlier deliveries may have occurred. Gamboge is composed of a yellow resinous component (70-80%; morelloflavone) and a clear water-soluble Gum (20%). Gamboge is marketed in the form of dull, brownish-yellow cakes or lumps. When powdered, it has a rich golden color. Gamboge is used as a transparent colorant in dyes, glazes, varnishes, and watercolors. The carbohydrate gum acts as a natural binder. The yellow color fades when exposed to light or Ozone. In some cases it has recovered its color when placed in the dark.
- See also [Uemera Dye Archive (Touou/Kusashio)]
Synonyms and Related Terms
Garcinia sp.; Natural Yellow 24; gomaguta (Esp., Port.); Gummigutt (Deut.); gomme-gutte (Fr.); gomma gutta (It.); giallo Cambogia (It.); gamboji (Jap.); shio (Jap.); kiyo (Jap.); gamboge (Ned., Port.); camboge; cambogia; gum gutta; gutto gumbo; guti ambar; gambogium; rattan yellow; wisteria yellow; gummi-gutti; Siam gamboge; Ceylon gamboge; gokatu gamboge
Risks
- Discolors to red with ammonia and other alkali.
- Fades in sunlight or ozone.
- Toxic by ingestion.
Physical and Chemical Properties
- Yellow resinous portion is soluble in ethanol.
- Colorless carbohydrate portion is soluble in water.
- Burns with an odor of resin.
- Turns red in dilute alkali solutions.
- The small amorphous particles are transparent in transmitted light.
- ISO R105 Lightfastness Classification = 2-3
- Density = 1.2
- Refractive Index = 1.582-1.586
Additional Images
Gamboge
Powdered gamboge
Gamboge
Silk dyed with gamboge, Uemera Dye Archive
Resources and Citations
- J.Winter, "Gamboge", Artists Pigments, Volume 3, E. West FitzHugh (ed.), Oxford University Press: Oxford, 1997.
- Encyclopedia Britannica, http://www.britannica.com 'Gamboge' Accessed: June 1, 2003
- The Dictionary of Art, Grove's Dictionaries Inc., New York, 1996 Comment: 'Pigments'
- R. J. Gettens, G.L. Stout, Painting Materials, A Short Encyclopaedia, Dover Publications, New York, 1966
- Ralph Mayer, A Dictionary of Art Terms and Techniques, Harper and Row Publishers, New York, 1969 (also 1945 printing)
- M. Doerner, The Materials of the Artist, Harcourt, Brace & Co., 1934
- R.D. Harley, Artists' Pigments c. 1600-1835, Butterworth Scientific, London, 1982
- F. Crace-Calvert, Dyeing and Calico Printing, Palmer & Howe, London, 1876
- Helmut Schweppe, Schweppe color collection index and information book
- Book and Paper Group, Paper Conservation Catalog, AIC, 1984, 1989
- R.Feller, M.Curran, C.Bailie, 'Identification of Traditional Organic Colorants Employed in Japanese Prints and Determination of their Rates of Fading', Japanese Woodblock Prints, Allen Memorial Art Museum, Oberlin College, Oberlin, 1984
- "Violin Varnish Glossary" at www.violins.on.ca/luthier.vargloss.html
- CRC Handbook of Chemistry and Physics, Robert Weast (ed.), CRC Press, Boca Raton, Florida, v. 61, 1980 Comment: density=1.2
- Art and Architecture Thesaurus Online, http://www.getty.edu/research/tools/vocabulary/aat/, J. Paul Getty Trust, Los Angeles, 2000