Study on the coloring mechanism of the Ru celadon glaze in the Northern Song Dynasty |
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| Affiliation: | 1. Institute of Modern Physics, Fudan University, Shanghai 200433, PR China;2. Department of Cultural Heritage and Museology, Fudan University, Shanghai 200433, PR China;3. Zhejiang Provincial Institute of Cultural Relics and Archaeology, Hangzhou, Zhejiang 310014, PR China;1. Institute of silicate cultural heritage, School of material science and engineering, Shaanxi key laboratory of green preparation and functionalization for inorganic materials, Shaanxi University of Science and Technology, Xi’an, 710021 China;2. CNRS, CEMES, Toulouse University, 31055, Toulouse, France;1. Department of Conservation Science, the Palace Museum, Beijing, 100009, People’s Republic of China;2. Zhejiang Provincial Institute of Cultural Relics and Archaeology, Hangzhou, Zhejiang, 310013, People’s Republic of China;3. Object Department, the Palace Museum, Beijing, 100009, People’s Republic of China |
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| Abstract: | The Ru kiln is one of the five most famous kilns in the Chinese Song Dynasty. To clarify the coloring mechanism of the Ru celadon glaze, the celadon samples from the Ru Guan kiln site of Qingliangsi were analyzed by spectrophotometer, X-ray fluorescence spectrum, Raman spectroscopy, scanning electron microscopy and X-ray photoelectron spectrum. The results indicated that the molar ratios of SiO2/Al2O3 and CaO/(CaO + Al2O3) affected the formation of micro-bubbles, anorthite crystals and phase separated structures. A large number of bubbles and anorthite crystals formed special glossiness and opacifying effect in the Ru celadon glaze. And then, dense phase separation droplets in the amorphous region were in short-range order, but their diameters (31–46 nm) were too small to form visible structural colors on glaze surfaces. Only “opal effect” was formed by the light scattering, which added the aesthetic feeling for the Ru celadon. Besides, the phase separation droplets intensified the segregation of iron, and thus deepened the chemical color and made the Ru celadon glaze appear green-blue. Due to the neutral to alkaline soil at the Ru Guan kiln site, the water in the soil and its corrosion on the Ru celadon glaze resulted in the formation of Si–OH bond. |
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| Keywords: | Ru Guan kiln Qingliangsi Celadon glaze Northern Song Dynasty Coloring mechanism |
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