A case study on Hoeamsa Temple, Korea: technical examination and identification of pigments and paper unearthed from the temple site
Heritage Science volume 10, Article number: 20 (2022)
This study applied various scientific analyses to one fragment of paper and three pigments excavated from earthenware found in the Hoeamsa Temple site at Yangju, Korea, which is believed to have been built in the early twelfth century. Radiocarbon dating of the paper fragment suggests a manufacture date between 1460 and 1646 (at a 95% confidence interval). It was estimated to have been used during the early and middle period of the Joseon dynasty (1391–1776), when the Hoeamsa Temple site was rebuilt. In addition, by staining the fiber of the paper fragment with Graff “C” stain, the paper’s raw material was identified as paper mulberry through dislocation, cross-marking, and transparent membrane, which are characteristics of the bast fiber. Efforts were made to identify their material properties and manufacturing techniques of the three types of pigments. Color difference analysis was performed by distributing the pigments in large areas to reveal characteristic differences according to the color difference of the pigment. We found that green-type pigments are malachite and atacamite, red-type pigments are hematite based on the element Fe, and white-type pigments are quartz and muscovite based on the elements Si and Al. In addition, as the size distribution of the three types of pigments is wide and has a multi-peak distribution curve, it was concluded that the pigments were used without purification.
The Hoeamsa Temple site in Yangju, Gyeonggi province, South Korea, was designated as Historic Site No. 128 in 1964 (Fig. 1a). Though its establishment date is unclear, the first documentary record of Hoeamsa Temple is found in the book Dongguk Yeoji Seungram (1481) that dates it back to 1174. The book reveals that envoys from China’s Jin (金) dynasty visited the temple. The monument to Taegosa Wonjeungguksa in Goyang was erected to commemorate Venerable Wonjeung (1301–1382), an eminent monk in the late Goryeo dynasty. According to the record, “I left home at the age of 13 and became a disciple of Gwangji (廣智) at Hoeamsa”. Hoeamsa is confirmed here to have already been built in 1313. Despite being located in a mountainous region, a south corridor was built that could be seen from temples in the plains and that exhibited the palace and temple arrangement styles of the Goryeo dynasty [1,2,3]. Therefore, it is estimated to have been constructed in the late twelfth century.
According to Lee , analytical research of pigments in Korea began after John Winter’s study on the component analysis of ancient Korean pigments . Throughout the 1990s and 2000s , researchers analytically investigated the pigments applied to murals, portraits, and decorative paintings, and studies on the reproduction and restoration of traditional pigments found whiting, noerok, hematite, copper pigments, and ink to be the main ingredients [7, 8]. Innovation in this field continues and recent efforts have been made to address limitations of existing analytical techniques or to apply new ones. Every year new analytical studies emerge on the various cultural property pigments, including murals, Buddhist paintings, portraits, decorative paintings, and dancheong [4, 9].
Recently, other methods of analysis are also being widely used . Several studies have been published on identifying raw materials of pigments using Raman spectroscopy and Raman matching , on identifying pigments using a non-destructive technique , on pigment particle size using Raman half-width , and on identification and diagnosis of pigments using Terahertz radiation .
Most of the cases used in the analysis of dancheong pigments in Korea are those of pigments remaining in wooden structures [15, 16]. The National Research Institute of Cultural Heritage in South Korea investigated and analyzed the dancheong pigments of 44 wooden structures spread throughout Korea for four years [17, 18]. Most of them were created until the late Goryeo-Joseon period. However, this scientific data is also an analysis of pigments remaining in wooden structures. Pigments excavated from the Hoeamsa Temple site have been packaged and stored in handmade paper, and this is the only case in Korea where a lump of pigments has been officially stored and discovered.
In Korea, due to the rapid progress of industrialization since the 1970s, dancheong pigments have been replaced by chemical pigments, which are cheap and have good color fastness. In 2014, regarding dancheong construction in the standard specification for cultural property repair , it is stipulated that certain materials are used for the dancheong pigments and color numbers were designated in the specification, whilst chemical pigments are reported as a type of dancheong pigment. In addition, dancheong pigments are used based on the contents of the standard specification, unless otherwise specified in the design or instructed by the responsible authority. Consequently, the use of traditional dancheong pigments is in decline, and the remaining ancient dancheong architecture is being replaced with chemical pigments.
In addition, there are insufficient data and records on both the use of mineral pigments obtained from nature, and the current state of the remaining ancient dancheong buildings, which are declining in number due to their being replaced with chemical pigments. Consequently, it is difficult to secure scientific data concerning ancient dancheong. As the Hoeamsa Temple site was built in the early twelfth century and was well supported by kings until the end of the Joseon dynasty, this study is significant as it analyzes the raw materials of pigments used during the early and mid-Joseon dynasty (1391–1776). Furthermore, our findings may be used as basic data to elucidate the characteristics of pigments used in those eras.
The main aim of this study was to examine the ancient paper and pigments found in historic sites. We aimed to identify the pigments used in early and mid-Joseon dynasties (1392–1776) and obtain new information about traditional dancheong pigments. The raw materials of the paper fragment were identified through the morphological characteristics of the fibers, and the dates were estimated by radiocarbon dating. The characteristics of the pigments were confirmed through analysis of component, particle size, color, and crystal structure. Through these processes, both the characteristics of the raw materials of paper and pigments used in temples in the early and mid-Joseon dynasty and the production process of pigments were identified, which are anticipated to serve as basic scientific data for preserving and restoring temples and dancheong.
Materials and analysis methods
The samples used in this study were pigments excavated from the Hoeamsa Temple site in Yangju (Fig. 1b): the pigments were wrapped in paper and placed in pottery. There were 16 pigments and one paper fragment. Based on color, three samples were selected from the 16 pigments, which were relatively unmixed. Figure 2 demonstrates the excavated pottery (Fig. 2a), pigments (Fig. 2b–d), and paper (Fig. 2e).
The excavated pigments and paper specimens were radiocarbon dated using the accelerator mass spectrometer (AMS) 1MV HVE 4110 (HVEE, The Netherlands). For sample pretreatment, the paper specimen was washed with deionized water to remove soil on the surface and chemically treated using the AAA method (acid-alkali-acid, 0.5 M HCl, 0.1 NaOH, 0.5 M HCl) [20, 21]. The program Oxcal v4.2.4 was used to convert the radiocarbon dating into calendar dating, and the Intcal20 calibration curve was applied .
The paper fiber identification was based on the Graff “C” method, which is accessible in ISO 9184-4, and the fiber morphology was observed using a Nikon fluorescent microscope (Eclipse Ni, Japan) . A low vacuum electron microscope (Hitachi TM3000, Japan) was used to observe the sample surface.
The stereomicroscope BX51 from Olympus was used to confirm whether the pigments excavated from the Hoeamsa Temple site were mixed. To measure the color difference of the pigments, a color difference meter (spectro-guide) from Gardner was used to express the CIE L*, a*, and b* values. X-ray diffraction spectroscopy (Mepyrean, Panalyical, The Netherlands) was used to analyze the main component minerals of the pigments. The analysis conditions were 40 kV, 40 mA, 2 theta, range of 5°–80°, scanning interval of 0.04°, and scanning time of 0.5 s. Measurements were performed through the continuous scan method. To analyze the microstructure of the excavated pigments, scanning electron microscopy-energy dispersive spectroscopy (SEM–EDS) was applied through SEM of Jeol (JSM-5910LV, Japan), and the surface of the pigments was coated in platinum (Pt). The principal element analysis was conducted using an x-ray fluorescence spectrometer (Zetium, Panalyical, The Netherlands). The white and red pigments were analyzed using a standard calibration curve, while the green pigments were analyzed using the software Omnian, which is a semi-quantitative program using standard samples provided by Panalytical. To measure the particle-size distribution, 0.2 g of the pigment was dispersed for 24 h using 20 ml of 1% sodium hexametaphosphate (Sigma-Aldrich), and Masterisizer 2000 (Malvern, UK) was used.
Results and discussion
As in Fig. 3, the radiocarbon dating of the paper sample was found to be 340 ± 34 (BP). Years BP [before present, (BP)] were calculated in the 1950s using Libby half-life (5568 ± 30 years): the year 1950 was set as 0, as there was a drastic change in the ratio of radiocarbon components in the atmosphere; thus, dating is difficult to measure after this time [24, 25].
As shown in Fig. 3 and Table 1, through radiocarbon dating, the paper sample was determined to be from CE 1455–1646 with a 95% confidence interval and an error range of 191 years. According to Kim Hong-sik , “Hoeamsa has been a subject of interest to many people as a grand Buddhist temple of the last Goryeo dynasty and early Joseon dynasty period. Hoeamsa’s reconstruction took place after 1472…”. Furthermore, “the appearance of the architecture is very similar to the late Goryeo dynasty and early Joseon dynasty”.
The paper is therefore thought to have originated sometime between the early and mid-Joseon dynasty and is considered to have been manufactured after the establishment of Hoeamsa. Paper from the Joseon dynasty was generally made of pure mulberry trees, and Gangwon Province, in particular, was so prolific in producing handmade paper that there were 15 paper manufacturing plants making handmade paper during the Joseon dynasty . Given that Gangwon Province consists of mountainous terrain located in the middle eastern part of the Korean Peninsula , making it difficult to access from the outside, and that the Hoeamsa Temple was where King Taejo stayed, due to which it has maintained a close relationship with the royal family , it is believed that handmade paper excavated from the temple site was procured and supplied locally.
Paper fibers can largely be classified into wood and non-wood fibers, and the latter can be further subdivided into herbaceous, bast, seedling, and leaf fibers. The inner bark of some dicotyledonous plants, including flax, hemp, kenaf, paper-mulberry, gampi, and mitsumata, is used to obtain bast fiber. Mulberry (Bruroussonetia papyrifera, Vent.), bamboo (Phyllostachys edulis, Carr.), mitsumata (Edgeworthia papyrifera), and Gampi (Wikstroemia canescens, Meisn.) are the most important paper fibers in the East . Bamboo can be distinguished from mulberry, mitsumata, and gampi by identifying the presence of long, fairly narrow fibers, and small, rectangular, and thick-walled parenchyma cell elements. In particular, Korea uses mulberry (Bruroussonetia papyrifera, Vent.) as its main raw material . Mitsumata and gampi have a broad central portion of fibers and are distinct from common bast fibers. Mulberry fiber features a thick fiber wall, with distortion and joints also observed. An important feature of oak mulberry fibers that distinguishes them from other bast fibers is the presence of thin transparent membranes [32, 33].
Korea has a record of producing handmade Korean paper from the Goryeo dynasty. Korean paper was selected as a major export item in recognition of its superb quality until the late Joseon dynasty. The reason is that, unlike Xuan paper in China and Washi in Japan, there is a large difference in the degree of orientation of the paper [34, 35]. On using a stereoscopic microscope on the surface fiber shape, it was observed that thin and long fibers were entangled and that the sample was too small to distinguish the direction of the fibers, even after attempting to distinguish the degree of orientation [39, 40]. An excavated paper fragment with pigments is shown in the photographs below (Fig. 4).
The fibers of the paper wrapping the pigments reacted by turning reddish brown in the Graff “C” stain . As shown in Fig. 5c, the transparent membrane enveloped around the fiber and the cross-marking, dislocation, and longitudinal striations of the fiber were observed, thereby confirming that the specimen is paper-mulberry bast fiber [32, 38,39,40].
The surface of a paper fragment was magnified and examined by scanning it with an electron microscope. As with the optical microscope, this allowed us to observe the anatomical characteristics of the bast fibers (Fig. 6). Impurities were present on the fiber surface; however, since no irregular particles were observed, there seems to be no separate inorganic filler (calcium carbonate is sometimes applied to make the surface of the paper smooth) .
Close-up images were captured via stereomicroscope to more precisely observe the pigments excavated from the Hoeamsa Temple site, and green, red, and white pigments were detected (Fig. 7). Green pigment was mixed with the red pigment (Fig. 7a), while white pigment was partially mixed with red pigment (Fig. 7b), and red pigment was partially mixed with the white pigment (Fig. 7c).
Color difference analysis
The hiding and tinting power of a pigment is dependent on particle size. Modern pigments are manufactured with uniform particle size to maintain uniform hiding power and coloring power. However, unlike modern pigments, historical pigments affect the color of the paint layer because they are not all composed of particles of uniform size . The colors of pigments are thus quantified through the chromaticity measurements to identify the objective color value of pigments and distinguish them from the color characteristics of similar systems [42, 43].
The L* value, which measures brightness, ranges from 41.59 to 79.05. The white pigment showed the highest brightness value at 79.05, while the green pigment and red pigment had values of 58.20 and 41.59, respectively. In terms of brightness value, the three types of pigments reveal a distinct difference within a wide range. The a* value, which indicates the measure of green (− a*) and red (+ a*), ranged from − 2.25 to 22.75. Of particular interest is the a* value of the red pigment that revealed a high degree of redness at 22.75, while the a* value of the green pigment was the lowest at − 2.25. The b* value, which indicates the measure of blue (− b*) and yellow (+ b*), ranged from 7.44 to 26.26. The b* value of the red pigment was the highest at 26.26, while that of the white pigment was the lowest at 7.44 (Fig. 8).
Component mineral analysis
An X-ray diffraction analysis was performed to identify the mineral species of the green, white, and red pigments (Fig. 9). Quartz was detected in all of the pigments. The green pigment showed peaks of malachite, atacamite, cerussite, and quartz, and a small amount of illite. The components that can reveal the green color would be malachite and atacamite, which have the element Cu as the main component, and quartz and illite can be discerned with the components contained in the soil. Cerussite (PbCO3) is a white raw material and implies the possibility that the workers at the time might have mixed the color white to elicit the color they wanted. Reports of the use of white lead in murals and paintings support this possibility . White pigments are mostly made of clay minerals having quartz, muscovite, and illite as the main constituent minerals and the red pigment showed quartz, hematite, illite, and kaolinite. Minerals are identified, and it is judged that the red color is due to iron oxide derived from hematite.
Based on the SEM–EDS mapping analysis (Table 2), Cu comprised 4.09% of the green pigment. Further, C, O, Si, Pb, and Cl were also detected. This SEM–EDS result, which contains elements Cu and Cl, supports the results of the X-Ray Diffraction. Previous studies have reported that atacamite particles are angled and very thick, and that lighter green particles have higher Cu and Cl content . A small amount of atacamite is present with Cl content of 0.33%. All in all, regarding the pigments used in green-based dancheong detected in Korean cultural properties, atacamite accounts for 45%, celadonite 39%, the pigments used in combination with other pigments (such as atacamite + cerusite or atacamite + carbon black) 15%, and malachite 1% . In addition, recently reported research results show that copper chloride was widely used among green pigments used in large Buddhist banner paintings during the Joseon dynasty, and the possibility of copper trihydroxychloride (atacamite, paratakamite, botalachite, etc.,) naturally or artificially manufactured as natural minerals continues to be raised [47,48,49]. In particular, the main elements constituting the copper chloride pigment were Cu, Sn, Zn, and Pb . As can be seen from the results of the green pigment SEM–EDS in this study, the elements Cu, Pb, and Sn were detected, all possibilities that the element Pb was derived either from copper chloride or from Sn and cerussite need to be taken into consideration.
The principal element of the white pigment is Si (18.46%); O, C, Al, and K were also detected. The red pigment showed 7.81% of Fe, and consists of O, C, Si, and Al.
The microstructure results through SEM analysis are as below (Table 3). It is reported that both malachite and chlorite are generally fibrous and have a variolitic and botryoidal structure with a spherical appearance when aggregation occurs . As confirmed through SEM, fine spherical particles of the green pigment aggregated to form a single mass as a botryoidal structure. In previous studies, hematite was reported to be flat-like, and large with small aggregates layered together . However, hexagonal or anhedral particles were not detected in the white pigment; the pigment showed a flat surface, thus differing from the form of the red pigment, and the white pigment had an amorphous shape. Only the surface of the particles is formed in a plate-shape, which was observed to be smooth. Hematite is known to appear as aggregates of fibrous crystals, or as mica hematite in a flat shape in sheets. In the red pigment, the flat-like crystals, with smooth surfaces, were densely stacked and formed a single aggregate. Groups of fibrous crystals were also observed. It has been reported that quartz is so hard due to anhedral crystal growth and that in rare cases some crystals may exist in subhedral fragments of hexagonal prismatic form .
Table 3 shows the result of the SEM–EDS point analysis for the pigments from which impurities have been removed. In the point analysis, as opposed to the mapping analysis, it was confirmed that the content of the main elements increased. In the case of the green pigment, it was confirmed that the Cu (23.68%) and Cl (5.3%) content were increased compared to the SEM–EDS mapping analysis. In the white pigment, of Si (31.95%), O, C, Al elements were quantified. The red pigment confirmed Fe (19.98%), O, C, Si and Al elements.
Principal element analysis
An x-ray fluorescence spectrometer was used to conduct a quantitative analysis of the principal elements of the pigments. The results of the green pigment are as follows: SiO2 31.20 wt%, CuO 27.90 wt%, Al2O3 9.19 wt%, and PbO 8.27 wt%. The results of the white pigment are SiO2 64.30 wt% and Al2O3 18.20 wt%. The results of the red pigment are as follows: SiO2 40.60 wt%, Fe2O3 24.90 wt%, and Al2O3 19.80 wt% (Table 4).
Particle size analysis
In general, even with pigments having the same component and color, the smaller the granularity, the brighter the color. Size and color are interrelated, and in particular, saturation and brightness determined by the absorption and scattering characteristics are largely dependent on the size of the pigment according to the Mie theory . This change in the properties of the material is a general feature of pigments, and the thicker the particles of the pigment, the more light is absorbed and the less it is reflected, thus causing the color to become darker. On the contrary, fine pigments become brighter. In addition, particle size can be used as an important parameter when determining pigments to be used for repair and restoration. In addition, it is reported that the size of pigment particles affects not only color but also important physical properties of pigments such as concealment, oil absorption, and workability [43, 54].
As in Fig. 10, the average particle size of the green pigment was the largest of the three types of pigment (52.44 μm), followed by the red pigment (35.88 μm) and the white pigment (16.11 μm). As all three types of pigment have a distribution curve in the form of multiple peaks, it was judged that when preparing the pigments, they were neither purified to the same particle size nor separated according to particle size. The green pigment distribution ranges widely from 0.40 to 2000 μm. In addition, the span value of 9.02 shows that it has the widest degree of sorting range of the three types of pigment. The span value was used to represent the distribution width of particles. The narrower the distribution, the smaller the value. The span value of the white pigment is 5.0 and that of the red pigment is 4.8, the lowest degree of sorting.
The raw material of the paper fragment was Brussonetia papyrifera, a source of bast fibers, which is estimated to date between CE 1455 to 1646 and is believed to have been made after the establishment of the Hoeamsa Temple site.
To identify the objective color value of the pigment, chromaticity measurements were performed, and the difference between the brightness value and redness levels of the three types of pigments was found to be remarkable. The color white had a high brightness value, whereas the red pigment exhibited a high degree of redness.
As a mineral characteristic of the three types of pigments, green pigments were identified as malachite and atacamite centered on the element Cu, with cerussite also being detected; the elements Cu, Pb, and Sn were detected together in SEM–EDS. Accordingly, it is highly likely that pigments were made available mainly by combining malachite and atacamite, revealing the color green, with cerussite showing the color white. White pigments were white clay minerals—quartz, muscovite, and illite—whereas red pigments were composed of Fe, Al, and Si as main elements, and hematite and clay minerals such as illite and kaolinite as the other elements.
Through particle size analysis of pigments, it was feasible to infer the manufacturing process of pigments, and it is highly likely that the particle size distribution curve did not go through the glaze manufacturing process when pigments were being made. In the case of green-type pigments, it is judged that the particle size distribution curves are multiple since they are colored together with cerussite.
The key limitation of this study is the lack of samples collected. If sufficient samples are used, the degree of aging and purification of fibers can be estimated through the double staining method (Saflanine + Astrablue).
Through this study, the ingredients of pigments, manufacturing processes, and methods of using pigments (regarding coloring) excavated from the Hoeamsa Temple site, one of the greatest temples that received a lot of reverence as a royal temple, were identified, and by measuring the date using paper fragments, it was possible to assess the characteristics of pigments and raw materials for paper fragments from the early to mid-Joseon period. It is anticipated that these findings can serve as basic data for cultural properties that use pigments such as paintings and dancheong cultural properties, and that they can also be utilized as scientific data if cultural properties need to be repaired or restored through traditional methods.
Availability of data and materials
Accelerator mass spectrometer
Scanning electron microscopy–energy dispersive spectroscopy
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The authors would like to acknowledge the Korea Institute of Geoscience and Mineral Resources, which provided assistance in radiocarbon dating estimations. Special thanks to the officials of the Gyeonggi Cultural Heritage Research Institute, Gyeonggi Cultural Foundation for preserving precious cultural heritage samples.
This study was conducted as part of the National Research Institute of Cultural Heritage R&D Project (Project number: NRICH-1605-C02F-1).
The authors declare that they have no competing interests.
Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
The original version of this article was revised: there was an error in affiliation 4.
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Go, I., Mun, S., Lee, J. et al. A case study on Hoeamsa Temple, Korea: technical examination and identification of pigments and paper unearthed from the temple site. Herit Sci 10, 20 (2022). https://doi.org/10.1186/s40494-022-00653-1
- Ancient pigment
- Hoeamsa Temple
- Bast fiber
- Joseon dynasty