Note 410 — Chapter XII · YUNG CHÊNG PERIOD (1723–1735)
Reading edition
A recipe given in the T’ao lu (bk. iii., fol. 12 verso) for the lu chün glaze speaks of “crystals of nitre, rock crystal, and (?) cobaltiferous manganese (liao) mixed with ordinary glaze.” But apart from the uncertain rendering of liao (which Bushell takes as ch’ing liao, i.e. the material used for blue painting), it is difficult to see how this composition, including the ordinary porcelain glaze, can have been fired in the muffle kiln.