High-fired green speckled glaze. A 'tea dust' glaze first occurred at kilns in Shaanxi and Henan during the Tang dynasty. Teadust glazes were used on a multitude of pottery even in the Ming dynasty and actually on provincial wares during the Qing as well. In the Yongzheng period during the Qing dynasty 'tea dust' glaze was revived and developed in Jingdezhen for use on Imperial wares, probably in an imitation of bronze.
A