- Research article
- Open Access
A study on the painting techniques and materials of the murals in the Five Northern Provinces’ Assembly Hall, Ziyang, China
© Hu et al.; licensee Chemistry Central Ltd. 2013
- Received: 18 March 2013
- Accepted: 28 May 2013
- Published: 3 June 2013
A limited amount of analytical data is available on the techniques and materials used in the murals of the Qing dynasty (1636–1911) in China. The Five Northern Provinces’ Assembly Hall (1861–1874) is located in Wafangdian on the confluence of two rivers. It has the largest murals in Shaanxi Province. This paper presents the first comprehensive investigation of the painting techniques and materials of the murals in the Five Northern Provinces’ Assembly Hall. The analytical methods include polarized light microscopy (PLM), microscopic examination on cross-sections, x-ray fluorescence (XRF), x-ray diffraction (XRD), micro-Raman spectroscopy (μ-RS), Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy with an energy-dispersive spectrometer (SEM-EDX), which have been used to examine the paint layer stratigraphy, plaster layers, the priming layer and inorganic pigments composition. The results show that the carrier was firstly prepared with two levels of coarse layers, which are made of clay, sand and rice straw applied onto the brick wall, and a fine coat layer made of lime, clay, sand and cotton follows. Then a kaolin-pigmented priming layer was painted on the fine coat, which was finally painted with red lead, red ochre, cinnabar, atacamite, malachite, botallackite, orpiment, yellow ochre, Prussian blue, smalt, azurite, lead white and flame carbons on top. The research suggests that the painting materials of the murals of the Five Northern Provinces’ Assembly Hall are original and the techniques were well implemented and followed the traditional and standard way in ancient China. But a few details present strong local characteristics, such as using rice straw, cotton and kaolin as original materials which were more convenient to obtain. This study also indicates that only one red dyestuff was found, and the other colourants are all inorganic. Except Prussian blue, smalt and botallackite used in ancient mural in China were less reported, and the rest of the pigments represent traditional Chinese painting materials. In addition, the usage of the imported pigments Prussian blue and smalt proves that the geographic position of the Five Northern Provinces’ Assembly Hall was of crucial importance for trade.
- The Five Northern Provinces’ Assembly Hall
- Murals in the Qing dynasty
- Painting technique
- Pigments identification
Research reports on the murals of the Qing dynasty are significantly fewer than for earlier dynasties. Furthermore, an overwhelming amount of related literature is focused on the content or art value [1, 2], compared with that, limited analyses of the materials and techniques have been reported. In order to understand the painting techniques and materials, the paint layer samples were examined and analyzed by polarized light microscopy, microscopic examination on cross-sections, x-ray fluorescence, x-ray diffraction, micro-Raman spectroscopy, Fourier transform infrared spectroscopy and SEM-EDX. It is the first time that the comprehensive analyses have been carried out on the murals of the Five Northern Provinces’ Assembly Hall. Study on the materials is not only useful to understand the technique of folk wall painting in the Qing dynasty, but also crucial for subsequent conservation on the murals.
28 samples were taken from different coloured areas of the murals, including red, green, yellow, blue, brown, black and white paint layer, 11 of them come from the transit hall, 17 from the main hall. In addition, 8 plaster samples were extracted individually from western wall of the transit hall, western and northern wall of the main hall, containing two coarse layers and a fine coat.
Samples were embedded in a transparent resin (poly methyl methacrylate), then ground and polished to obtain cross-sections. Subsequent optical observations were carried out with a Japan Hirox KH-7700 digital microscope.
Polarized light microscopy
A Leica DMLSP polarized light microscope was used for examinations in transmitted and reflected light with a microphotography capability. Powder samples were embedded in Melt Mount with a refractive index of 1.662 and covered with a cover-glass.
Elemental determination of the samples was carried out by a Bruker ARTAX-400 x-ray fluorescence spectrometer, with the measuring conditions: Molybdenum target, voltage 30 kV, current 900 μA, live time 200 s.
Rigaku D/max-2500 x-ray diffraction with a CuK radiation, 40 kV and 200 mA, graphite monochromator filter was used to characterize the pigment composition. The plaster samples were ground into powder for x-ray diffraction analyses. Diffraction patterns were interpreted by comparison with JCPDS data.
The powder samples were dispersed by anhydrous alcohol before analysis. Analyses were carried out by a Renishaw in Via-Reflex micro-Raman spectrometer comprising a Leica DMLM microscope, with the following conditions: a laser excitation at 514.5 nm; a 50× microscope objective; 300 mm slits; integration time 10s and 5 to 20 accumulations.
Fourier transform infrared spectroscopy (FT-IR)
FT-IR spectroscopy for the priming layer was measured on a Bruker Tensor 27 Fourier transform infrared spectrometer. The sample was ground into powder and dispersed in KBr disks. Spectrums were collected from 4000 to 400 cm-1, with a resolution of 4 cm-1 and 64 scans.
Some samples of the wall paintings from the Five Northern Provinces’ Assembly Hall consist of several paint layers. It is available to gain elements in every layer by SEM-EDX analysis to get comprehensive information of the materials. SEM images by secondary electron (SE) or back-scattered electrons (BSE) and EDX analyses were taken by a Tescan VEGA 3XM scanning microscope equipped with an energy dispersive x-ray spectrometer. An accelerating voltage of 20 kV was used and a work distance of 15 mm. Except for one gold sample was measured directly with a low voltage of 15 kV, other cross-section samples were gold-coated.
The northern wall of the main hall has been seriously damaged. A large area of plaster was detached and fell down because of mobility of soluble salt. Three plaster layers were observed at the position of the loss of the mural. The plaster consists from bottom to top of the first coarse layer (10-12 mm), the second coarse layer (5-7 mm), and the fine coat (3-5 mm).
The paint layer tratigraphy and the pigments
Layer (from top to bottom)
Not continuous black layer
Dark blue layer
Malachite, lead white
Not continuous blue layer
Red lead, PbO2
Si, K, Co, As,Fe, Bi, Ni
Not continuous blue layer
Malachite, lead white
Malachite, lead white
Cu, Cl, Pb
Botallackite, lead white
Hg, S, Pb
Cinnabar, lead white
Dark red layer
Fe, Ca, K, Al, Si
Hg, S, Pb
Cinnabar, lead white
Pb, Fe, Ca, K, Al, Si
Red ochre, lead white
C, O, Al, Si, Ca, Fe
Fe, Ca, S, K, Al, Si
Fe, Ca, K, Al, Si
Pb, As, S
Red lead, lead white, PbO2, orpiment
Au, Ag, Cu
Brownish red layer
C, O, Pb
Red lead, binding media
Thin layer with red particles
EDX results of the plaster samples and the priming layer (wt %)
Gx-1 1st coarse layer
Zx 1–3 1st coarse layer
Gx-2 2nd coarse layer
Zx 1–2 2nd coarse layer
Zb 3–2 2nd coarse layer
Gx-3 fine layer
Zx 1–1 fine layer
Zb 3–2 fine layer
Zx 1–9 surface of fine layer
Zx 2–5 surface of fine layer
XRD results of the plaster samples (wt %)
Zx 1–3 1st coarse layer
Gx-2 2nd coarse layer
Zx 1–2 2nd coarse layer
Zb 3–2 2nd coarse layer
Zx 1–1 fine layer
Zx 1–9 fine layer
Gx-3 fine layer
Zb 3–2 fine layer
The priming layer
Elemental analyses on the priming layer were carried out on the cross-sections. The priming layers were found to be dominated by Si, Al and O, and atomic ratios of Si and Al are almost equal, which suggests that the priming layer is made of kaolinite (Al2Si2O5(OH)4).
Kaolin, a natural hydrated silicate of aluminium, was widely used as white pigment in ancient wall paintings and painted sculptures in ancient China . But using kaolin as priming layer is relatively rare. There was a thin kaolin layer beneath the paint layers in the Mogao Grottoes murals in Wei dynasty (220–266), Jin dynasty (266–420) and the Southern and Northern dynasty (420–589) . It was also found in the priming layer of the clothes of a portrait in late Tang period (836–907), cave 10 . Kaolin is not only produced in the vicinity of Jingdezhen, but also commonly found in other areas. The large use of kaolin as priming layer in the murals of the Five Northern Provinces’ Assembly Hall is consistent with the geology of the region of Ziyang, where three kaolin ores (Jinchuan town, Qingjing town and Zihuang town) were recorded in Ziyang county annals.
Prussian blue has been widely known as one of the earliest synthetic pigments and a complex chemical compound containing iron (Fe4[Fe(CN)6]3). It was prepared accidentally by Diesbach in 1704 in Berlin. It has been commercially available to artists by 1724 and widely used in paintings since the mid 18th century [10, 11]. As a saturated radiant hue at a moderate cost, Prussian blue replaced the expensive natural ultramarine gradually. This pigment was widely identified on painted artifacts in Europe, East Asia and South America [12–14]. However, reports of Prussian blue used in ancient murals in China are limited. Therefore, the time of Prussian blue began to be imported to China and its applications need further research.
Another dark blue painted layer from an architecture part of the western mural in the main hall was thicker than others. Some larger pigment grains have been detached from the painting. It might be attributed to either mechanical friction of the wooden planks or aging of the binding medium. This blue sample was found as conchoidal glassy fragments in singly polarized fields with a low refractive index (n < 1.662), suggesting a characterization of smalt (Figure 7c). Smalt is an artificial, glass-like potash silicate pigment, which is strongly coloured with cobalt oxide. Concerning smalt identification, besides the optical microscopy, the elemental micro-analysis by EDX is the best method. This blue sample contains several elements, including Si (58.0%wt), Co (4.7%wt), K (13.4%wt), As (11.6%wt), Fe (4.2%wt), Bi (4.5%wt) and Ni (1.5%wt). K is the trace of the manufacturing process. Elements such as As and Fe indicate the origin of CoO from the mineral cobaltite (Co, Fe)AsS, and Ni should come from the mineral smaltite (Co,Ni)As3-2. Bi exists in line with using the cobalt ore, which is coexisted with bismutite Bi2(CO3)O2, as an original material to produce smalt in Europe . Furthermore, the Raman spectrum of sample zx 1–8 (Figure 8b) shows weak peaks (not sharp) at 461, 788, 1093 cm-1, which proved the presence of smalt.
The composition of smalt varies considerably in SiO2 (65–71, 66–72), K2O (16–21, 10–21), CoO (6–7, 2–18) and in impurities of other oxides (Al, Ba, Ca, Cu, Fe, Mg, Mn, Ni, Na) . Ajò D. analyzed the painting materials of Ciro Ferri’s frescoes in Italy and found that smalt contains Si (~81.8%), Bi (<1.0%), K (~7.1%), Ca (~2.6%), Fe (~1.9%), Co (~3.3%), Ni (<1.0%) and As (~2.2%) by SEM-EDX . Daniilia S. found two kinds of smalt in St Stephen’s wall paintings at Meteora, Greece, the EDX results show the following mean composition: (a) Si (68.9%), K (22.6%), Co (4.1%), Ca (2.2%) and Fe (2.5%); (b) Si (85.4%), K (3.9%), Co (3.3%), Ca (1.1%), Fe (2.1%), Al (1.6%) and As (2.7%) . Compared with these results, smalt used in the Five Northern Provinces’ Assembly Hall contains much more As, which suggests that the original mineral is rich in As.
The earliest invention of smalt was in Saxony and its surrounding areas in Germany. Smalt was formed by the following steps: Firstly, cobalt ore was fused and mixed with white quartz after grinding and baking, then potassium carbonate or other cosolvents were added, the molten material was poured into cold water to form brittle glass in the end. Evidence of smalt used as pigment dates from the 15th to early 19th century. In the early 17th century, it is mentioned that smalt has been widely used in oil painting and substituted lapis lazuli and azurite as they became more and more scarce [15, 18]. While in ancient China, the pigment was usually used in architecture coloured drawing of the Qing dynasty, for instance, JianFu palace in the Forbidden City, Xiannongtan in Beijing, Shuxiang Temple in Chengde and some other sites . Since smalt has been produced in Germany and Italy at that time, it is uncertain to determine the source of smalt used in murals of the Five Northern Provinces’ Assembly Hall until more analytical data collected.
Sample gx-9, gd-2 and zx1-7 have a single green layer with a large amount of Cu. Some green angular shaped particles with a high refractive index (n > 1.662) are correspond to malachite. It has been further confirmed by XRD. Similarly, malachite was found in the third green layer of sample gx-10.
The PLM photomicrograph of sample zx1-6 (Figure 7d) shows green particles of uniform size (10-20 μm) and round shape, with a low refractive index (n < 1.662), which are as same as atacamite. Furthermore, the presence of atacamite has been proved by EDX (40%at Cu and 21%at Cl) and μ-RS.
Copper-based green pigments were identified in samples, malachite and atacamite, are the principal green pigments widely found in ancient wall paintings [19–21]. They were used to depict trees, grasses, garments of the figure and the panel framings of the Chinese folding screens in the Five Northern Provinces’ Assembly Hall murals. The colours range from light green to dark green. Malachite was widely used in every mural, while atacamite-pigmented layers were thick and just for the decoration of the figures and horses in the main hall murals.
Sample zb2-3 from the northern wall of the main hall contains Cu and Cl was not determined by PLM analysis. Green rounded particles combined with lead white, similar to lead white, but with a lower index of refraction were observed in PLM photomicrograph. Figure 8c shows the Raman spectrum of sample zb2-3. Peaks at 153, 175, 250, 278, 401, 446, 512, 778, 850, 895, 1049 cm-1 are well matched with the standard botallackite (155(m), 175(m), 251(m), 279(m), 324(w), 401(vs), 450(vs), 503(w), 678(w), 857(m), 897(m)) and lead white (1050(vs)) in database. It was also proved successfully by XRD analysis.
Botallackite, one structural polymorph of atacamite, is a rare green pigment due to its lower stability. It has been found on the painted sculptures at Dunhuang Grottoes and Houtu Temple located in Jiexiu, Shanxi Province, as well as on the wall painting of the Fuxi Temple in Gansu Province . While on the murals of the Five Northern Provinces’ Assembly Hall, botallackite was not only found in the green sample of zb2-3 as main compound, but also in mixtures with atacamite or malachite. Botallackite is the most unstable phase in all copper trihydroxychloride, which suggests that it might change to atacamite. Unfortunately, study on botallackite is much less than other green pigments. The formation and development between structural polymorphs of copper trihydroxychloride, and the source, application and protection of botallackite need to be further explored.
Red and brown pigments
In sample zx1-14, two paint layers were observed. A thin white layer was covered by a pink layer formed by red and white particles. The red pigment is very fine and looked red with a high refractive index (n > 1.662). Chemical analysis performed on the pink layer of zx1-14 cross-section indicates the presence of Fe, Pb, Ca, Si, Al, K, C and O, which suggests red ochre and lead white. As well sample gx-14 was also proved as red ochre based on the identification of Si, Al and other elements from clays. Red and yellow iron-based pigments are the earliest and indispensable painting materials for ancient painters. It is reported that earthy pigments containing iron oxides and hematite were found to be used in the murals in every dynasty of ancient China .
It is known that red lead and cinnabar are considered as the commonest pigments of ancient China [23, 24]. These two kinds of red pigments were also extensively used in the murals of the Five Northern Provinces’ Assembly Hall.
The XRD pattern of sample gx-8 is with peaks at 26.38, 30.78, 28.53, indicating the presence of Pb3O4 and PbO2. A brown layer on top and some red particles underneath were shown in the cross-section micrograph (Figure 7e), which reveals that the brown layer is PbO2, an aging product of red lead . Besides, a few yellow particles contain As and S were observed on the surface of the sample, which suggests that orpiment was mixed with red lead. And pinkish brown hue of the sample was caused by partial aging of red lead.
Sample zx2-5, 2–4 and 2–3 were collected from the western wall painting in the main hall depicted with a pearl in the clouds, which is dark red in centre and surrounded by orange cycles. The PLM photomicrographs of sample zx2-3 and zx2-4 show the characteristics of red lead. Sample zx2-5 was taken from the dark red centre and with two paint layers (Figure 7f). An orange layer was covered by a red surface. Amounts of Hg (35%at) and S (36%at) in the upper layer reveal that the red pigment is cinnabar. And the lower one is from the next external orange cycle paint layer and painted with red lead (74%wt Pb). The results suggest that cinnabar was applied directly over the red lead layer. In addition, sample gx-11 and gd-1 have a red layer on top of a blue layer (Figure 7g). These samples were collected from the frame of the traditional Chinese folding screens depicted on the transit hall wall, which is decorated with a colourful pattern of red blossoms or stars on bright blue background. The presence of cinnabar and lead white in the upper layer are detected from the data of 26.0%wt Hg, 8.3%wt S and 48.8%wt Pb. The lower one is pigmented with Prussian blue, which was identified by PLM. The results indicate that the blue colour was painted in the frame first and then the red flowers were depicted on it. In conclusion, two paint layers of the samples formed by the painting sequence.
Furthermore, another red colourant was found in the main hall mural. The cross-section examination of sample zd-3 shows a thin translucent pink paint layer is painted above a thicker white under-painting. A large amount of Pb (64%wt) reveals that the white layer was pigmented by lead white. The pink layer was characterized as a reddish pink lake or dyestuff by PLM analysis. In addition, a large amount of C (more than 41%wt) and a relatively higher amount of Al also suggests that the red colourant is an organic dyestuff. It is well-known that dyestuff is usually added with alum or other inorganic substrates such as chalk, silica or gypsum. It is possible to use organic lake to produce pink hue because it began to be imported during the Qing dynasty.
In summary, most of the red and brown colourants are pigments as red ochre, red lead and cinnabar, only one sample from the main hall contains dyestuff or a lake. Bright red areas were painted with cinnabar and orange ones were red lead.
Yellow was used less in the murals than other colours. Bright yellow was identified as orpiment. It was used to paint the panel framings of the Chinese folding screens. In sample zb2-4, 23%at As and 34%at S show that the pigment is orpiment. Orpiment was found either with a large amount on the northern mural in the main hall or few particles mixed with red lead in the pinkish brown framing of the western transit hall mural.
There is another yellow pigment in a light ochre yellow colour was used to depict the cloth hanging from the table or the hanging flag in the western main hall mural. Pigment particles in sample zx1-13 are very fine and looked yellowish red with a high refractive index (n > 1.662), combined with the content of Fe, Ca, S, Si, Al and K proves the presence of yellow ochre.
White pigment was found from a single white paint layer, an under-painting or a coloured paint layer mixed with other pigments from the cross-sections examination. In sample zx1-12, zd-3 (red) and zx1-13 (yellow), a large amount of Pb in the white layer reveals it is lead white. On the other hand, the presence of very fine white particles in many samples with a high refractive index was also proved as lead white by PLM analysis.
The use of lead white as white pigment has been increased gradually since the Qin and Han dynasty (211 B.C-8) . Furthermore, it was more common in Shaanxi Province . Lead white used in the murals of the Five Northern Provinces’ Assembly Hall either as the major constituent or mixed with other coloured pigments to produce different hues.
Black was found on the frame of painting or as contour lines of the depictions. Three samples with black colour were collected. These black particles are very fine and with a high refractive index (n > 1.662), combined with the content of C, O suggests the presence of flame carbons.
Three paint layers were observed from the cross-section of zd-2 (Figure 7h). There is a brownish red layer between a gold leaf and some red particles. The gold layer was found to be dominated by Au (89.3%wt) with less amounts of Ag (8.5%wt) and Cu (2.2%wt), which could be explained reasonably as elements Au, Ag and Cu belong to the same subgroup may naturally symbiosis. The below brownish red layer with a large amount of C and less amount of Pb gives the evidence that it is the binding media to attach gold leaf. Meanwhile, the presence of Hg (8.1% at) and S (7.7% at) suggests that the red particles are cinnabar.
Qing Chen has found red lead and PbO2 in gold leaf samples from the mural of the Second Grotto of Eastern Thousand-Buddha Cave in Gansu Province and the Longzang Temple in Sichuan . The adhesive material on the One-thousand-hand Buddha at Dazu Grotto was a mixture of HgS, tong oil and lacquer . Yong Lei found a layer of binding media within red iron oxide was under the gold leaf of the murals in the Temples under Chieftain Lu in Liancheng, Gansu Province . In conclusion, cinnabar, red lead or other red pigments were commonly added into the gilding adhesive aims to enhance the colour of gold . Therefore, the presence of HgS and Pb3O4 in the adhesive material of the gold leaf samples from the assembly hall mural was proved following the traditional way.
8 plaster and 28 paint layer samples were investigated by various analytical methods, including polarized light microscopy, microscopic examination on cross-sections, x-ray fluorescence, x-ray diffraction, micro-Raman spectroscopy, Fourier transform infrared spectroscopy and SEM-EDX to examine the stratigraphy of the mural and identify the materials used.
The entire stratigraphy of the mural in the Five Northern Provinces’ Assembly Hall from bottom to top is divided into 6 parts: brick wall - the first coarse layer (10-12 mm) - the second coarse layer (5-7 mm) – fine layer (3-5 mm) - priming layer (20-60 μm) – paint layer (5-40 μm). In addition, it is assumed that the murals have not been restored and the materials are original by the examination in site and investigation of the cross-sections. Some samples have several painting layers as a result of the painting sequence.
The main ingredients of the plaster are quartz, calcite, illite and plagioclase. The coarse layer is a mixture of clay, sand and rice straw, while the fine coat consists of lime, clay, sand and cotton. Recipes of the plaster in the transit hall and main hall are basically the same. The priming layer was identified as kaolin which is relatively rare. However, it is smooth, high whiteness and in line with the principle of using local materials for ancient murals. Three kaolin ores in Ziyang are all along the rivers, which also proves the developed shipping and commerce of Wafangdian in the middle of the Qing dynasty.
Table 1 shows the results of the pigments used for the wall paintings in the Five Northern Provinces’ Assembly Hall. Only one red dyestuff was found, other colourants are all inorganic. Red lead, red ochre, cinnabar, atacamite, malachite, botallackite, orpiment, yellow ochre, Prussian blue, smalt, azurite, lead white, flame carbons were used. Pigments like smalt, atacamite were found only in the main hall murals, others were used in all murals. The usage of the imported pigments Prussian blue and smalt proves the geographic position of the Five Northern Provinces’ Assembly Hall was of crucial importance for trade. Meanwhile, the selective application of smalt is in accordance with the high value of the paintings and the important position of the main hall. Lead white was widely used, both as a pigment by itself or as a whitening agent mixed with other pigments. In addition, Prussian blue and botallackite as main components of pigments used in ancient murals in China was not widely reported, so research on the source, application and protection should be carried on. The rest of the pigments identified on the examined samples, represent the common painting materials in China.
The development of the technique of Chinese ancient murals is divided into several stages. It is well-known that China was in a political and economic boom in the Tang dynasty (618–907), and the technique of murals had reached its peak. Then a comprehensive technique of the ancient temple mural was formed in the Song dynasty (960–1279). From the Ming dynasty (1368–1644), the quality of the murals was on the decline. As a result of the development of the literati paintings in the Qing dynasty, murals were designed and drawn by the organization of folk painters, which was without unified management and standard, the technique was simplified in general. However, the investigation indicates that the murals of the Five Northern Provinces’ Assembly Hall are of high quality and the techniques followed the traditional and standard way.
a Figure 7a and g are from German analyses report of the murals of The Five Provinces’ Assembly Hall.
KJH Graduate student for a Master’s degree, major in Conservation of Cultural Heritage, School of Cultural Heritage, Northwest University, Xi’an(Shaanxi), P.R. China.
CBB Professor and researcher, Shaanxi Province Institute for the Conservation and Restoration of Cultural Heritage, Xi’an, P.R. China. Graduated from Northwest University.
LYM Associate research fellow, Shaanxi Province Institute for the Conservation and Restoration of Cultural Heritage, Xi’an, P.R. China. Graduated from Xi’an Academy of Fine Arts.
KB Research Assistant, Shaanxi Province Institute for the Conservation and Restoration of Cultural Heritage, Xi’an, P.R. China. Graduated from Beijing University.
DBL Research Assistant, Shaanxi Province Institute for the Conservation and Restoration of Cultural Heritage, Xi’an, P.R. China. Graduated from Xi’an Academy of Fine Arts.
BBF Associate research fellow, Shaanxi Province Institute for the Conservation and Restoration of Cultural Heritage, Xi’an, P.R. China.
This work is a part of a German-Chinese cooperation in the preservation of Cultural Heritage. We would like to thank Technical University of Munich Prof. Erwin Emmerling, Catharina Blaensdorf, Miriam Schanz, Isabell Wagner, Linda Zachmann and Laura Thiemann for their assistance and support. And thank Yin Xia (Key Scientific Research Base of Ancient Polychrome Pottery Conservation, State Administration for Cultural Heritage) for his assistance in the PLM analyses. We also want to show our gratitude to Prof. Liqin Wang, Prof. Cheng Liu, Dr. Rui Wen, Dr. Yong Ling, Prof. Xue Ling in Laboratory of Cultural Heritage Research and Protection in Northwest University.
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