Li, J., Zhao, Y., Li, Y., & Huang, W. 1994 [Comparison on the lac quality of three species of lac insects.]. Forest Research 7(4): 456-459.

Notes: Tests have been conducted for the gradation of the raw lac produced by three species of lac insects along with the contents of hard and soft resins respectively. Results show that the content of soft resin excreted by Kerria chinensis Mahd. in the summer generation is lower than those by K. sindica Mahd. and, K. lacca Kerr. In the winter generation it is comparatively higher. The content of yellow pigment is richer in both generations. The soft resin content of the latter two is higher in both generations though somewhat higher in winter. On the contrary, the yellow pigment content in the raw lac yielded by K. chinensis Mahd. is lower both in summer and winter generation.