Influence of Porcelain Saggar on Coloration of Mi’se Celadon and the Underlaying Mechanism

Chemical composition, thermal expansion and chromaticity of common celadon and Mi’se celadon shreds from Housi’ ao kiln site of Shanglin Lake in Tang and Five Dynasties were analyzed by using EDXRF, thermal expansion instrument and spectrophotometer. At the same time, the crucial process parameters of firing Mi’se celadon in Yue kiln were systematically analyzed and the influence of saggar material and firing method on the color of the celadon was further verified, thus preliminarily identifying the crucial factor of color generation. It was also found that there is no obvious difference in the content of Fe₂O₃ between Mi’se celadon and common celadon in Tang and Five Dynasties, indicating that the Fe₂O₃ content is not the main reason that affects the color of the two celadons. The porcelain saggar after refiring with mouth edge glaze to seal the Mi’se celadon belonged to F_TMS, while the rest belonged to F_PTP and F_WPT. The porcelain saggar effectively suppressed the entering of oxygen-rich air to the porcelain saggar during the cooling process and prevented secondary oxidation of the incomplete solidified glaze layer on the surface of the celadons, which is the main reason why the color of the Mi’se celadon is different from that of common celadons.