Difference between revisions of "Dragon's blood"
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| − | [[File:Dragon_treef5.jpg|thumb|Dragon's blood tree | + | [[File:Dragon_treef5.jpg|thumb|Dragon's blood tree ''Dracaena cinnabari'']] |
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| − | ''Dracaena cinnabari'']] | ||
== Description == | == Description == | ||
| + | [[File:ddracoformV1.jpg|thumb|Dragon tree ''Dracaena draco'']] | ||
| + | A transparent, red, resinous exudation from the fruit of several types of palms found in southeast Asia (''Calamus draco'', ''Daemonorops draco'', ''Daemonorops propinquus'', ''Dracaena draco'' and Dracaena cinnabari) and South America (Pterocarpus draco). Dragon's blood is available as red sticks, cakes, or as a powder. The primary red coloring component is dracorubin. It evolves benzoic acid when heated. Dragon's blood was traded as early as Roman times. It was used as a red colorant in medieval manuscript illuminations. Dragon's blood has been used to stain [[varnish|varnishes]] for violins and as a colorant for [[plaster]], [[marble]], and [[paint|paints]]. The resin has also been used as a resist in photoengraving to protect [[zinc]] plates from [[acid]]. The red color is fugitive when exposed to light and air, but may be partially protected by a resin film layer. | ||
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== Synonyms and Related Terms == | == Synonyms and Related Terms == | ||
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[[[SliderGallery rightalign|f150sem.jpg~SEM|f150edsbw.jpg~EDS]]] | [[[SliderGallery rightalign|f150sem.jpg~SEM|f150edsbw.jpg~EDS]]] | ||
| − | == | + | == Physical and Chemical Properties == |
| − | Soluble in ethanol, ethers, and oils. Insoluble in water, mineral spirits and turpentine. | + | * Soluble in ethanol, ethers, and oils. |
| − | + | * Insoluble in water, mineral spirits and turpentine. | |
| − | + | * Melting Point = 120 C | |
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== Additional Images == | == Additional Images == | ||
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<gallery> | <gallery> | ||
File:dragon's blood_1.jpg|Lump of dragon's blood | File:dragon's blood_1.jpg|Lump of dragon's blood | ||
| − | File:dragon C100x.jpg|Dragon's blood | + | File:dragon C100x.jpg|Dragon's blood at 100x (visible light left; UV light right) |
</gallery> | </gallery> | ||
| − | + | ==Resources and Citations== | |
| − | == | ||
* R. J. Gettens, G.L. Stout, ''Painting Materials, A Short Encyclopaedia'', Dover Publications, New York, 1966 | * R. J. Gettens, G.L. Stout, ''Painting Materials, A Short Encyclopaedia'', Dover Publications, New York, 1966 | ||
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* ''Dictionary of Building Preservation'', Ward Bucher, ed., John Wiley & Sons, Inc., New York City, 1996 | * ''Dictionary of Building Preservation'', Ward Bucher, ed., John Wiley & Sons, Inc., New York City, 1996 | ||
| − | * ''Encyclopedia Britannica'', http://www.britannica.com Comment: "dragon's blood." | + | * ''Encyclopedia Britannica'', http://www.britannica.com Comment: "dragon's blood." accessed 7 Apr. 2005 . |
* ''The Dictionary of Art'', Grove's Dictionaries Inc., New York, 1996 Comment: "Pigments" | * ''The Dictionary of Art'', Grove's Dictionaries Inc., New York, 1996 Comment: "Pigments" | ||
| − | * Wikipedia | + | * Wikipedia: http://en.wikipedia.org/wiki/Dragon%27s_blood (Accessed Jan. 25, 2006) |
| − | * | + | * "Violin Varnish Glossary" at www.violins.on.ca/luthier.vargloss.html |
| − | * Website | + | * Website: www.fw.vt.edu/dendro/dendrology/main.htm (accessed Oct. 3, 2005) |
| − | * Art and Architecture Thesaurus Online, | + | * Art and Architecture Thesaurus Online, https://www.getty.edu/research/tools/vocabulary/aat/, J. Paul Getty Trust, Los Angeles, 2000 Comment: lists 'cinnaharis' as synonym |
[[Category:Materials database]] | [[Category:Materials database]] | ||
Latest revision as of 11:37, 24 July 2022
Description
A transparent, red, resinous exudation from the fruit of several types of palms found in southeast Asia (Calamus draco, Daemonorops draco, Daemonorops propinquus, Dracaena draco and Dracaena cinnabari) and South America (Pterocarpus draco). Dragon's blood is available as red sticks, cakes, or as a powder. The primary red coloring component is dracorubin. It evolves benzoic acid when heated. Dragon's blood was traded as early as Roman times. It was used as a red colorant in medieval manuscript illuminations. Dragon's blood has been used to stain varnishes for violins and as a colorant for Plaster, Marble, and paints. The resin has also been used as a resist in photoengraving to protect Zinc plates from Acid. The red color is fugitive when exposed to light and air, but may be partially protected by a resin film layer.
Synonyms and Related Terms
Daemonorops draco; Daemonorops propinquus; Dracaena cinnabari; Dracaena draco (dragon tree); Natural Red 31; CI 75200 (Draccorubin); CI 75210 (Dracorhodin); sangre de drago (Esp.); Drachenblut (Deut.); sang-dragon (Fr.); aima toy drakoy (Gr.); sangue di drago (It.); drakenbloed (Ned.); sangue de dragão (Port.); cinnabaris (Pliny); dragon blood (sp); dragons blood (sp); dragonsblood (sp); Calamus draco
Physical and Chemical Properties
- Soluble in ethanol, ethers, and oils.
- Insoluble in water, mineral spirits and turpentine.
- Melting Point = 120 C
Additional Images
Lump of dragon's blood
Dragon's blood at 100x (visible light left; UV light right)
Resources and Citations
- 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)
- Hermann Kuhn, Conservation and Restoration of Works of Art and Antiquities, Butterworths, London, 1986
- R.D. Harley, Artists' Pigments c. 1600-1835, Butterworth Scientific, London, 1982
- Dictionary of Building Preservation, Ward Bucher, ed., John Wiley & Sons, Inc., New York City, 1996
- Encyclopedia Britannica, http://www.britannica.com Comment: "dragon's blood." accessed 7 Apr. 2005 .
- The Dictionary of Art, Grove's Dictionaries Inc., New York, 1996 Comment: "Pigments"
- Wikipedia: http://en.wikipedia.org/wiki/Dragon%27s_blood (Accessed Jan. 25, 2006)
- "Violin Varnish Glossary" at www.violins.on.ca/luthier.vargloss.html
- Website: www.fw.vt.edu/dendro/dendrology/main.htm (accessed Oct. 3, 2005)
- Art and Architecture Thesaurus Online, https://www.getty.edu/research/tools/vocabulary/aat/, J. Paul Getty Trust, Los Angeles, 2000 Comment: lists 'cinnaharis' as synonym