A similar black-glazed bottle vase was included in the exhibition, Iron in the Fire, Ashmolean Museum, Oxford, 10 May - 19 June 1988, pp. 82-3, no. 93, where it is noted that "about 1720, Père d'Entrecolles recorded that the Jingdezhen 'mirror-black' was a high-temperature glaze coloured with low-grade Chinese cobalt." Other vases of this type, are illustrated by J. Ayers, Chinese Ceramics: The Koger Collection, London, 1985, no. 137; and in the Min Chiu Society exhibition catalogue, Monochrome Ceramics, Hong Kong, 1977, no. 125.