瓷器盖圆形印“O”的为一等品。盖方形印“□”的为二等品,盖三角形“△”的为三等品,盖“次品”的为不合格产品。布匹标签印有红字者为一等品,印绿字者为二等品,印蓝字者为三等品。 Porcelain cover with round print “O” is first-class product. The square seal “□” is the second grade, the triangle “△” is the third grade, and the “second grade” is the inferior product. Those printed with the red label on the cloth label are first-class goods, those printed with green characters are the second-grade goods, and those printed with blue-print are third-grade goods.