Effect of CaO/MgO on Strips in Yellow Hare’s Fur Glaze

Hare’s fur glaze is a high-temperature calcium glaze. With laterite, grass ash and limestone as the main raw materials, the effect of different CaO/MgO molar ratios on the hair pattern of the glaze was studied. When the CaO/MgO molar ratio is the range of (0.40:0.38)–(0.45:0.33), dendritic ε-Fe₂O₃ crystals with sizes of 150–250 nm were precipitated, so that the glaze surface is lightly coloured with strips. When the CaO/MgO molar ratio increases to (0.50:0.28)–(0.55:0.23), the ε-Fe₂O₃crystals precipitated in the form of short columns, with sizes of 70–150 nm, with an increase in the number of strips on the glaze. As the CaO:MgO molar ratio increases to (0.60:0.18)–(0.65:0.13), a relatively large number of ε-Fe₂O₃ crystals are present in the form of dendrites in the glaze, forming coarse yellow strips on the glaze. When the CaO/MgO molar ratio increases to 0.70:0.08, calcium feldspar crystal clusters and yellow ε-Fe₂O₃ dendritic crystals are precipitated. Meanwhile, Ca and Fe rich fractal structures are formed around the calcium feldspar, which promoted the precipitation of ε-Fe₂O₃ dendrite flowers, leading to the formation of thick orange rabbit pattern on the glaze.