Qing Dynasty (1644-1911), Jian Chai (Studio of the Silkworm Cocoon) Mark The small soapstone (steatite) seal of square shape with rounded canted top in imitation of a Warring states or Han dynasty seal, two simple incised lines to the sides, the underside carved in intaglio with the seal Bu Lu Wen Zhang Shi Yi Jing; the seal box probably made from a red slate and then covered in a black pigment, the top carved in relief with two long-tailed birds standing on a bending branch amidst further bamboo, the base with a two-character seal, Jian Chai; with a hardwood box. 1 1/2in (3.8cm) square, the seal; 2 5/8in (6.6cm) square, the slate box