WANG Xuequan ¹, CHEN Tianmin ², WU Junming ¹, YU Yongbin ¹, WU lin ¹
(1. Center of Ancient Ceramics Research, Jingdezhen Ceramic University, Jingdezhen 333001, Jiangxi, China; 2. School of Archaeology and Museology, Jingdezhen Ceramic University, Jingdezhen 333403, Jiangxi, China)

Abstract: The chemical composition of blue-and-white porcelain, glaze and blue-and-white parts of Yaoli blue and white porcelain in Jingdezhen in the middle Ming Dynasty was analyzed by energy dispersed X-ray fluorescence spectrometer (EDXRF). Combined with the test data of blue and white porcelain of Zhejiang Longtan kiln, comparative analysis is made. The results show that: The Al₂O₃ content (~ 20.78 wt.%) in Yoli blue and white tire was higher than that inLongtan Kiln (~ 17.59 wt.%), while the SiO₂ content (~ 71.40 wt.%) was lower than that in Longtan kiln (~ 78.92 wt.%). However, the contents
of porcelain tyre TiO₂, Fe₂O₃ are consistent with the features of typical porcelain tyre in south of our country. The standard deviation of chemical composition of the blue and white glaze of Yao Li is larger than that of Longtan Kiln, and the average content of R₂O in the blue and white glaze of Yao Li (~ 4.40 wt.%) is higher than that of Longtan Kiln (~ 2.33 wt.%). The flux of the blue and white glaze of the two kiln sites is CaO, followed by K₂O, which is mainly calcium alkali glaze, followed by calcium glaze, and part of the blue and white glaze of Longtan Kiln is alkali calcium glaze. The n(MnO)/n(CoO) values of Yaoli blue and white are 2.30–9.58, n(Fe₂O₃)/n(CoO) 1.20-6.26, n(MnO)/n(CoO) values of 6.59–14.37, n(Fe₂O₃)/n(CoO) values of 1.29–9.07, respectively. The blue and white parts of both of them have the characteristics of high manganese and lowiron, and the color is green to gray. Both of them use domestic cobalt material.

Key words: blue and white porcelain; Jingdezhen; Yaoli; Long Tan kiln; EDXRF