The EDXRF method was used to find the concentration of component elements in blue and white porcelain It was found that some elements in colorant were diffused towords glaze layer when the porcelain had been fired at high temperature Through the half value thickness calculation

the contribution of some elements from the procelain’s body to the measured intensity was also confirmed The experiment also indicated that the contents of various elements in the glaze layer of non decorated portions were definite in spite of the measuring sites

while those of some elements in decorated portions were dependent on positions