PROPERTY FROM A PRIVATE COLLECTION A Sky-Blue Glass circular Ink Box and coverWheel-engraved Qianlong four-character mark in a square and of the period, probably Beijing Palace Workshops The circular vessel with flat top and base and cylindrical sides, the glass of a rare sky-blue tone, a simple ridge cut to the box to fit snuggly with the cover. 2 7/16in (6.3cm) diam； 1 3/8in (3.5cm) high 透藍料圓盒 乾隆四字方框款 或爲北京宮廷造 Provenance: Chinese Porcelainpany, New York, mid 1990's 出處： 紐約 Chinese Porcelainpany，1990 年代中期 A similarly-toned transparent cobalt-blue glass dish bearing a wheel-cut Qianlong seal mark was sold at Christie's, Hong Kong, 'Luminous Colours: Treasures from the Shorenstein Collection' 1 December 2010, lot 2938. Other transparent blue glass vessels are illustrated in the exhibition catalogue, Elegance and Radiance , The Art Museum, The Chinese University of Hong Kong, 2000, pp. 142-43 and p.p.158-59, nos. 30 and 42 respectively and a later opaque white glass cylindrical box and cover is also illustrated, pp.246-47, no. 87. Another transparent blue glass vessel, (dish) dated to the eighteenth century is illustrated by C. Brown and D. Rabiner, The Robert H. Clague Collection: Chinese Glass of the Qing Dynasty, 1644-1911 , Phoenix Art Museum, 1987, no. 8.