Feldspathic glaze was much in vogue during the early 10th century, especially in Chinese porcelain. The wares of the Sung dynasty (era 960 to 1279 AD) are noted for the brilliant feldspathic glazes on the stoneware pottery. The decorations were indented, molded, carved or even incised.
The main varieties are Ju, kuan, Ko, Ting, Lung-ch'üan, Chün, Chien, Tz'u-chou, and Ying-ch'ing. Ju wares have stoneware body and are covered with a deep greenish-blue glaze with a fine crackle. The main ingredient used was feldspar in more quantity during the glazing process. Feldspathic glaze varies from pale green to lavender blue with a meshed crackle that was accentuated with a brown pigment.
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However, some of the pottery belonging to the period also shows an orange translucency on the delicate wares and the coarser varieties are opaque. They were exported from China to other places due to the beautiful varied hues and could stand the vigor of transportation. Many of the bowls with feldspathic glaze were fired mouth downward, leaving unglazed and bound with copper or silver.
All the articles with superb quality feldspathic glaze have a transparent green glaze. The early period wares are denser and have a less transparent glaze. The practice of fired pottery having feldspathic glaze are still being used today but are very uncommon.
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