See another blue-glazed dou in the Victoria and Albert Museum illustrated by Margaret Medley, 'The Illustrated Regulations for Ceremonial Paraphernalia of the Ch'ing Dynasty', T.O.C.S., vol. 31, 1957-1959, pp. 95-105, pl. 39a. Medley notes, p. 100, that in the Winter Solstice sacrifice held in the Temple of Heaven in 1748, blue porcelain vessels were used for the first time as stipulated by Emperor Qianlong, and these sacrificial rites continued throughout the Qing dynasty. Another blue-glazed Daoguang-marked dou was sold at Christie's New York, 18-19 September 2014, lot 923.