According to the researches from Kingery and Wang et al. [14,15], the separative-phase glaze is an artistic glaze, in which decorative design can be formed by the color contrast of different phases due to its phase separation structures. This glaze has abundant colors and assortment styles, and is not high to the requirement of colorant. Therefore, the separative-phase glaze can be widely used in art porcelain, household porcelain, and building porcelain, etc. with substituting iron ore slag for the costly metallic oxides and pigments.