A similar vase was sold in our New York Rooms, 24 March 2004, lot 236. Robin's egg blue glazes are opaque turquoise with overall purplish mottling and were first developed during the Yongzheng period as a free interpretation of Song dynasty Jun glazes. In the discussion of a Qianlong-marked vase of this type, illustrated by R. Krahl, Chinese Ceramics in the Meiyintang Collection, vol. 2, London, 1994, p. 252, no. 923, the author notes that in China this glaze is called lu Jun (furnace Jun) as "it was fired in a furnace of a lower temperature after the firing of the porcelain".