QIANLONG FOUR-CHARACTER INSCRIBED SEAL MARK WITHIN A SQUARE AND OF THE PERIOD (1736-1795)

Compare the unmarked bottle vase described as dark purplish brown that is also suffused with imitation realgar splashes illustrated in Elegance and Radiance: Grandeur in Qing Glass: The Andrew K. F. Lee Collection, The Art Museum, The Chinese University of Hong Kong, 2000, pp. 348-9, no. 136.