A RUBY-RED GLASS DISHIncised Qianlong four-character mark and of the periodThe deep rounded sides rising from a low straight foot to a slightly lipped mouth, the transparent glass of a rich ruby-red tone, the recessed base wheel-cut with a four-character markQianlong nianzhi enclosed within a double-square.17.8cm (7in) diam.Provenance: 清乾隆 寶石紅料盤砣刻方框「乾隆年製」楷書款Compare with a closely related purplish red glass dish, Qianlong four-character incised mark and of the period, in the Qing Court Collection, illustrated by Zhang Rong inLuster of Autumn Water: Glass of the Qing Imperial Workshop, Beijing, 2005, p.175, pl.37.盤為模製而成，敞口，弧壁下斂接圈足。通體為寶石紅色玻璃，半透明。足内磨製出一粗方框，框内陰刻「乾隆年製」 雙豎行楷書款。參考故宮博物院藏一件紫紅色玻璃盤，乾隆，見張榮編《光凝秋水：清宮造辦處玻璃器》，北京，2005年，頁175，圖版37。