釉是附着于陶瓷坯体表面的玻璃质熔融状物质。有与玻璃相类似的某些物理与化学性质。一般以石英、长石、黏土等为原料。釉不仅对陶瓷的胎体起保护作用,而且也是装饰和美化瓷器的重要手段之一。釉按外观特征可分为透明釉、乳浊釉、颜色釉、结晶釉、无光釉、裂纹釉、花釉等。颜色釉是由于釉中所含金属氧化物的不同,以及烧造气氛的各异,而形成的青、黑、绿、黄、红、蓝、紫等各种不同釉色的瓷器。白瓷虽属无色透明釉,但一般 Glaze is a glassy molten material attached to the surface of a ceramic body. There are some physical and chemical properties similar to glass. Generally quartz, feldspar, clay and other raw materials. Glaze not only plays a protective role on the ceramic carcass, but also one of the important means to decorate and beautify porcelain. Glaze by the appearance of features can be divided into transparent glaze, opaque opacity, color glaze, crystal glaze, matte glaze, crack glaze, glaze and so on. Color glaze is due to the different metal oxides contained in the glaze, as well as the different firing atmosphere, and the formation of green, black, green, yellow, red, blue, purple and other different glaze porcelain. Although white porcelain is a colorless transparent glaze, but in general