The turquoise glaze bottom of Qingganlong imperial porcelain is bright blue-green, containing iron rust spots and metal sulfides, with characteristic blue-green black to near black. It is one of the newly fired varieties during the reign of Qing Qianlong. The luxury of the turquoise glaze bottom of Qingganlong imperial porcelain attracts people's attention, because the turquoise glaze bottom is round, and the whole turquoise glaze bottom highlights the pattern, which is elegant and elegant.