From: New perspective on Jun glaze corrosion: study on the corrosion of light greenish blue and reddish purple glazes from Juntai Kiln, Yuzhou, Henan, China
Position
Na2O
MgO
Al2O3
SiO2
K2O
CaO
Fe2O3
Round area
0.4
7.3
67.7
5.7
14.5
3.9
Surrounding
1.0
8.9
76.3
4.8
6.2
2.3