A turquoise glass censer, Palace workshops, Beijing. Wheel-cut mark and period of Qianlong. photo courtesy Sotheby's of bombé form, the plain opaque turquoise glass with rounded sides set on three short rounded legs, the slightly everted rim flanked by...

An Imperial 'realgar' glass mallet vase. Palace Workshops. Mark and period of Qianlong. photo Sotheby's of opaque brilliant fiery orange, yellow ochre and chrysochlorous greenish-gold colour glass swirled together resembling the realgar mineral, the body...