Difference between revisions of "CNSM 1858, Small Dragon Robe, China (Qing Dynasty, 1644-1911 CE)"

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== Summary of results ==
 
== Summary of results ==
  
A mixture of carmine scale insects, lac and madder was identified for red dye. Crimson dye contained tannins, carminic acid, alizarin and purpurin. Blue dye was obtained from indigo plant.
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HPLC-MS analysis shows several common dyes were used to dye the Qing dynasty object. Bright yellow threads (part A) were dyed with pagoda tree buds due to the fact that a big peak corresponding to rutin is seen in HPLC profile of the yellow dye. Safflower was identified in red threads (part B), along with ''Phellodendron spp'', which is in good agreement with a dyeing recipe recorded in Tian Gong Kai Wu (Explotation of the Works of Nature, written by Song Yingxin in 1637). Indigo can be used not only to produce a blue color (part C), but also to produce various green colors by overdyeing with pagoda tree buds (part E) or Phellodendron spp.,(part F) Purple threads (part D) were dyed with a mixture of sappanwood and indigo.
 
 
''Editor's note'': The identification of carminic acid and usage of multiple red dye sources in one pieces was quite unique. The author is open to further discussion and would like to do collaborative work with institutions that have done similar research or have access to similar objects.  
 
  
 
== HPLC profile ==
 
== HPLC profile ==

Revision as of 10:06, 18 January 2018

Artifact Information

Small Dragon Robe, China (Qing Dynasty, 1644-1911 CE). Height: 94 cm Width: 136 cm

Exisiting dragon robes are far from rare. This one however, really is, due to its small size. The dragon motifs are exquisitely worked on a yellow silk ground with gold couching technique while polychrome silk threads are used for clouds, bats and flowers. The most plausible explanation for a dragon robe of this size is that it is tailored specially to fit a child emperor. (depicted by Yan Xue, translated by Huiwei Shen).


China National Silk Museum, Hangzhou, China. #1858.

Image of the small Dragon Robe. © China National Silk Museum, Hangzhou, China
Sampling of colored threads. © China National Silk Museum, Hangzhou, China

Analytical instrumentation and procedures

The dye was extracted from a thread (0.2-1mg) of the archaeological object in a solution of pyridine/water/1.0M oxalic acid as described by Mouri and Laursen [1]. The solution was evaporated to dryness under a nitrogen flow, and redissolved in 50 μL MeOH/H2O (1/1); subsequently, 20 μL of dye solution was injected onto HPLC column.


An extract was analyzed on an HPLC-PDA-MS system consisting of a Shimadzu LC-20A high performance liquid chromatography, a Shimadzu SPD-M20A photodiode array detector and a Thermo LTQ XL ion trap mass spectrometer. The separation was performed on a Shim-pack XR-ODS column (3.0 mm × 75 mm, 2.2-μm particle size) and a Phenomenex Luna C18 column (2.0 mm × 150 mm, 3-μm particle size). Columns were eluted with acetonitrile-water gradients containing 0.1% formic acid at a flow rate of 0.3 mL/min.


Summary of results

HPLC-MS analysis shows several common dyes were used to dye the Qing dynasty object. Bright yellow threads (part A) were dyed with pagoda tree buds due to the fact that a big peak corresponding to rutin is seen in HPLC profile of the yellow dye. Safflower was identified in red threads (part B), along with Phellodendron spp, which is in good agreement with a dyeing recipe recorded in Tian Gong Kai Wu (Explotation of the Works of Nature, written by Song Yingxin in 1637). Indigo can be used not only to produce a blue color (part C), but also to produce various green colors by overdyeing with pagoda tree buds (part E) or Phellodendron spp.,(part F) Purple threads (part D) were dyed with a mixture of sappanwood and indigo.

HPLC profile

Absorbance at 450nm (mAU) By Jian Liu, China National Silk Museum, Hangzhou
Possible compounds identified By Jian Liu, China National Silk Museum, Hangzhou

References

[1] [1] Xu X. Studies of samite with birds from Tibetan Tombs in Dulan of Qinghai. China Tibetology 1996; 1: 3-26.

[2] Richard A. Laursen and Chika Mouri "Decomposition and analysis of cathamin in safflower-dyed textiles", e-Preservation Science 2013, 10, 35-37.