AN 18TH/19TH CENTURY CHINESE CARVED BEIJING BLUE GLASS VASE Qing, of elegant facetted form. 19.5 cm high. Note: The appearance of Imperial glass during the Yongzheng period is discussed by Zhang Rong, Elegance and Radiance: Grandeur in Qing Glass - The Andrew K.F. Lee Collection, Hong Kong, 2001. Apparently the Imperial Palace glasshouse 'during the Yongzheng period had an organized management to oversee the production of glass with efficient systematic control'. Indeed, according to Peter Lam, there were probably two by the time of the early Qianlong period, a factory at Canchi Kou, and a glass workshop at Yuanming Yuan. This led to the production of monochromes exceeding all other types in both opaque and transparent glass, with forms embodying vases, straight-neck vases, boxes, jars, beakers, bowls & water pitchers. Many of the vases reproduced in this book are of the same simply-facetted design as the present lot. According to the Palace archives, the Yongzheng emperor inherited about thirty different colours from the Kangxi years of production in the Zaobanchu.