干旱区生态环境知识资源中心(Arid): Spectral Analysis of Main Mineral Pigments in Thangka

Arid

DOI	10.3964/j.issn.1000-0593(2019)04-1136-07
	Spectral Analysis of Main Mineral Pigments in Thangka
	Cen Yi 1; Zhang Lin-shan 1,2; Sun Xue-jian 1; Zhang Li-fu 1; Lin Hong-lei 1; Zhao Heng-qian 3; Wang Xue-rui 4
通讯作者	Sun Xue-jian
来源期刊	SPECTROSCOPY AND SPECTRAL ANALYSIS
ISSN	1000-0593
出版年	2019
卷号	39 期号:4 页码:1136-1142
英文摘要	As a work of art, Thangka has both high historical value and artistic value. The identification and analysis of the mineral pigments of the Thangka are of great significance to the identification, repair, digital archiving and reproduction of the Thangka. This is the first systematic spectral analysis of five kinds of main Thangka mineral pigment, commonly used in the process. Through an in-depth analysis of the spectral characteristics of mineral pigments, we summarized the spectral features of Thangka's main mineral pigments. By comparing the spectral characteristics of the same mineral pigment powder, blend bone glue and pigment on the pigment, we found that the reflectance of the powder pigment decreases after the blending of bone glue, and there are two strong absorption peaks near 1 447 and 1 928 nm. When you paint the glue soluble on the cloth, with the reduction of water paste in the paint, the two peaks become weaker, and the absorption peak at 1 447 nm or even disappears. Therefore, the spectra of mineral pigment powder and pigment on the cloth are very close. Mineral pigment powder can be directly used in the analysis of the Thangka pigment spectra match and analysis in the later period. Red mineral pigments on Thangka are cinnabar, whose mineral composition is HgS. The reflectance in the visible band rises after the first drop, and there is a deep absorption valley near 500 nm (430 similar to 530 nm). After the rapid rise of red, the reflectance curve near infrared changes slowly, and there are weak absorption valleys in the vicinity of 1 940 and 2 250 nm. There are three main types of Thangka yellow mineral pigments : desert tan(realgar, orpiment) , ochre and gold, whose main components are arsenic sulfide, iron oxide and gold. Their spectral characteristics are concentrated in the visible spectrum between 400 similar to 500 nm, and the absorption valley position and absorption depth of different pigments are different. Near infrared reflectance Ochre is low, and the 860 nm has appeared near the absorption peak ; while desert tan, realgar and orpiment in near infrared and shortwave infrared spectrum show high values and flat curves, with two weak absorptions in the valley near 1 890 and 2 230 nm. The absorption valley of gold in visible band is narrow and shallow, which can be used as the basis to distinguish it. Thangka's blue mineral pigment is azurite, which has strong absorption characteristics in 500 similar to 1 000, 1 500, 2 040, 2 285 nm and near 2 350 nm, and weak absorption characteristics in 1 885 and 1 980 nm. Thangka' s green mineral pigment is malachite, and the spectrum has a strong broad absorption feature in 550 similar to 1 000, 2 270 and 2 350 nm. Although the main mineral compositions of malachite and azurite are both copper carbonate, but the reflectance value of malachite in 900 similar to 1 900 nm increases slowly, and there is no absorption characteristic at 1500nm, which can be used to distinguish them. Thangka's white mineral pigments are mainly clay and clam, respectively, calcium carbonate and kaolin-clay. In the visible spectral range, clam has a weak absorption characteristic in 370 nm, and the clay has two obvious absorption characteristics in the 370nm and 730nm, which can be used to distinguish them. In the short wave infrared and near-infrared spectrum, clay has obvious absorption characteristics in 1 425, 1 930 and 2 230 nm, while clam has obvious absorption characteristics in 1 930 and 2 320 nm, plus a weak absorption characteristics in 1 440 nm. As for the same mineral pigment powder, the larger the mineral powder particle is, the darker the color of the pigment will be, and the lower the reflectance of the spectral characteristics will be.
英文关键词	Thangka Mineral pigment Hyperspectral Spectral feature extraction
类型	Article
语种	中文
国家	Peoples R China
收录类别	SCI-E
WOS记录号	WOS:000466450300024
WOS类目	Spectroscopy
WOS研究方向	Spectroscopy
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/218934
作者单位	1.Chinese Acad Sci, Inst Remote Sensing & Digital Earth, State Key Lab Remote Sensing Sci, Beijing 100101, Peoples R China; 2.Chengdu Univ Technol, Coll Earth Sci, Chengdu 610059, Sichuan, Peoples R China; 3.China Univ Min & Technol, Coll Geosci & Surveying Engn, Beijing 100083, Peoples R China; 4.Beijing Auspicious Earth Culture Commun Co Ltd, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Cen Yi,Zhang Lin-shan,Sun Xue-jian,et al. Spectral Analysis of Main Mineral Pigments in Thangka[J],2019,39(4):1136-1142.
APA	Cen Yi.,Zhang Lin-shan.,Sun Xue-jian.,Zhang Li-fu.,Lin Hong-lei.,...&Wang Xue-rui.(2019).Spectral Analysis of Main Mineral Pigments in Thangka.SPECTROSCOPY AND SPECTRAL ANALYSIS,39(4),1136-1142.
MLA	Cen Yi,et al."Spectral Analysis of Main Mineral Pigments in Thangka".SPECTROSCOPY AND SPECTRAL ANALYSIS 39.4(2019):1136-1142.