A CHINESE LEMON YELLOW-GLAZED BOWL. Qing Dynasty, Yongzheng mark and of the period. The deep rounded sides resting on a slightly tapered foot, covered overall save for the base with a brilliant pale egg-yolk yellow glaze, the base inscribed in underglaze blue with a six-character reign mark within a double circle, raised on a carved wood stand, 15.5cm diameter, 7cm H. (2) 清雍正 檸檬黃釉盌連木座，青花「大清雍正年製」楷書款 The Yongzheng period was a time of great innovations in the production of Chinese monochrome glazes. Among these, only yellow had a direct association with the Emperor. Produced from the early Ming Dynasty onwards yellow-glazed wares were used exclusively for ritual ceremonies. However, lemon-yellow glazed wares were a new innovation of the period when the antimoniate of iron was combined with tin oxide resulting in an opaque yellow glaze of brilliant hue and used daily within the palace. Of all the monochromes produced it was the most technically challenging to perfect.