A Study on the Physical and Chemical Properties of Sindica Lac

Studies have been conducted on the physical and chemical properties of the lac produced by Kerria sindica (Mahdihassan) Varshney. Experiments have shown that the lac produced by Sindica on different host trees in China keeps its original properties as compared with that in Bangladesh. The resin content is 5.63% higher and the colour index 2.96 lower. The shellac made from Sindica lac is superior to that from the Yunn-anensis lac. The colour index of the Sindica lac is lower by 3 or 4 numbers and the colour-changing rate is 1.5~3.5 times slower.