Comparison on the Lac Quality of Three species Of Lac Insects

Tests have been conducted for the gradation of the raw lac produced by threespecies of lac insects along with the contents of hard and soft resins respectively.The resultshave shown that the content of soft resin excreted by K.chinensis Mahd.in summer generation is lower than those by K.sindica Mahd.and No.4 lac insect,K.lacca Kerr.by 1%～2%.In winter generation it is comparatively higher and the content of yellow pigment isricher in both generations especially in summer one.It is 1～4 times that of each of the lattertwo.The soft resin content of the latter two is higher in both generations though somewhathigher in winter period.On the contrary,the yellow pigment content in the raw lac yieldedby K.chinensis Mahd.is lower both in summer and winter generation.