Similar langyao vases include one from the E. T. Hall Collection of Chinese Monochrome Porcelain, sold in our London Rooms, 7 June 2004, lot 280, where an article by Rosemary E. Scott explains the origin, chemical composition and characteristics of the langyao glaze, pp. 11-12; one from the Yin Collection, included in the Exhibition of Chinese Ceramics from Chicago Collections, 1982, illustrated in the Catalogue, no. 71; and a smaller example illustrated by Gorer and Blacker, Chinese Porcelain and Hard Stones, London, 1911, pl. 164 (left).