| Project/Area Number |
04044164
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| Research Category |
Grant-in-Aid for international Scientific Research
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| Allocation Type | Single-year Grants |
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| Section | Joint Research |
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| Research Institution | Tokyo National Rsearch Institute of Cultural Properties |
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Principal Investigator |
MIYAMOTO Nagajiro (1994) Tokyo National Rsearch Institute of Cultural Properties, 修復技術部, 部長 (60261252)
三輪 嘉六 (1992-1993) 東京国立文化財研究所, 修複技術部, 部長 (00222422)
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| Co-Investigator(Kenkyū-buntansha) |
LI Zuixion Dunhuang Accademy of Thailand, 保護研究所, 所長
KUCHITSU Nobuaki Tokyo National Rsearch Institute of Cultural Properties, 国際文化財保存修復協力室, 研究員 (50234456)
MATSUMOTO Shuji Tokyo National Rsearch Institute of Cultural Properties, 国際文化財保存修復協力室, 主任研究官 (80099960)
NISHIURA Tadateru Tokyo National Rsearch Institute of Cultural Properties, 国際文化財保存修復協力室, 室長 (20099922)
MASUDA Katsuhiko Tokyo National Rsearch Institute of Cultural Properties, 修復技術部・第二研究室, 室長 (40099924)
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| Project Period (FY) |
1992 – 1994
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| Project Status |
Completed (Fiscal Year 1994)
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| Budget Amount *help |
¥5,900,000 (Direct Cost: ¥5,900,000)
Fiscal Year 1994: ¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1993: ¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1992: ¥1,900,000 (Direct Cost: ¥1,900,000)
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| Keywords | China / Desert Region / Conservation of Cultural Property / Dunhuang Mogao Caves / Salt-crystarization Decay / Discoloration of Pigment |
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| Research Abstract |
We have continued to collect samples from the cave succeeded from the year before. These samples were scientifically analyzed and with a result we made an observation mineralogically and chemically as follows :
1. Analysis recognized that blackening of red pigment is caused by usual oxidization phenomenon of red lead (Pb_1O_4) to lead dioxide (PbO_2).
2. As another cause of blackening of red pigment, red oxide (Fe_2O_3) became iron sulfide (FeS_2). This was a new discovery.
3. Although green pigment did not show the difference in color, change in chemical composition was observed. Atakamite (Cu_2Cl (OH) _3) turned into Antlerite (Cu_3SO_4 (OH) _4).
4. Under the analysis of the effloresced salt taken from the surface of the wall painting, we have found sodium chloride (NaCl) from the area experience direct penetration of rainwater, and Gypsum (CaSO_4・2H_2O) from the area experience water penetration from the river. NaCl is a recrystallization of salt which was contained in a stone, which diluted and came out from the stone. Gypsum must have been produced chemically when overflow of riverwater with a high content of Sulpfuric ion and calsium found in the underground of the wall painting.
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