Difference between revisions of "Category:Gamboge: Ukiyo-e colorant"
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== Analysis == | == Analysis == | ||
− | + | Gamboge does not fluoresce under UVA radiation and does not produce a distinct pattern using Excitation Emission Matrix spectroscopy (EEM). As it is the only bright yellow colorant that does not fluoresce (of those analyzed) but also absorbs UVA induced fluorescence emitted by the paper, this negative indication was sometimes used to assign the presence of gamboge. | |
− | <gallery mode=packed heights=200px style= | + | <gallery mode="packed; heights=200px; style=text-align:left;"> |
− | Gamboge color.PNG|3D EEM plot of gamboge | + | Gamboge color.PNG|<center>3D EEM plot of gamboge</center> |
</gallery> | </gallery> | ||
Revision as of 18:20, 15 May 2020
Gamboge 藤黄(to-o): 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.
For the analysis, it was known that gamboge does not fluoresce in UV light (see below), Thus is was no surprise that gamboge did not produce a distinct pattern using the excitation emission technique. In fact, because it is the only bright yellow colorant that does not fluoresce (of those we have currently analyzed) and because it even absorbs the normal fluorescence given off from the paper, we sometimes used this negative indication to assign the presence of gamboge.
For more information see: Gamboge
Examples of Gamboge in Ukiyo-e Prints
Analysis
Gamboge does not fluoresce under UVA radiation and does not produce a distinct pattern using Excitation Emission Matrix spectroscopy (EEM). As it is the only bright yellow colorant that does not fluoresce (of those analyzed) but also absorbs UVA induced fluorescence emitted by the paper, this negative indication was sometimes used to assign the presence of gamboge.
Other Images of Gamboge
List of Prints
List of prints where indigo was detected
Pages in category "Gamboge: Ukiyo-e colorant"
The following 12 pages are in this category, out of 12 total.
G
K
- Kiyomasu I, Courtesan Reading a Poem, 28.198
- Kiyomasu II, Actor Ogino Izaburô I as Yamagami Gennai, Acting in the Aragoto Style with the Sumikazura Wig, 11.13297
- Kiyomasu II, Actors Segawa Kikunojô I as Yomogiu, Ichikawa Ebizô II as Tono no Hyôe, and Yamamoto Kyôzô as Kureha, 21.5459
- Komatsuken, Courtesan Parading with Two Kamuro, 11.19711
- Komatsuken, Young Man as the Bodhisattva Monju, 11.30137
- Komatsuken, Young Woman as the Bodhisattva Fugen, 11.30136