Number of bends that indicates spinning capacity of the wool is called crimp. Fibers with a fine crimp have many bends and usually have a small diameter. The hairy skin with washed fibre is sorted depending on the fibre diameter, colour, crimp, and strength.

An incubator is a device in which a certain temperature is maintained for hatching. Tiny eggs are tested to ensure that they contain perfect, disease-free worms. Then these are kept in the incubator for about 20 days till they hatch into a full larva or the caterpillar.

Sericin is a protein created by Bombyx mori in the production of silk. Silk is a fibre produced by the silkworm in production of its cocoon. It consists mainly of two proteins, fibroin and sericin.