Chinese Art A sang de boef pottery vase China, Qing dynasty, 19th century . . Cm 12,50 x 20,00. Bottle vase with globular body and tall thin slightly splayed neck, covered with thick dark red monochrome glaze. This type of objects, which spread in China during the 18th century - and successfully reproposed the following century - were also very popular in Europe where they were traded under the name of "sang de boef" due to the particular color of the glaze.