what type of proteins do they contain?
The Protein fiber of silk is composed mainly of fibroin
Silk
The protein fiber of silk is composed mainly of fibroin and is produced by certain insect larvae to form cocoons.
when did silk begin to be produced in china th millennium BC can you name some species from where we obtain this material? Bombyx mori how do these species release that material? By forming a cacoon by this insect is that material what they release- a cellulose or a protein or a fat? Natural protein fiber
wiki:5410199
Silk [SEP] Introduction
Silk is a natural protein fiber, some forms of which can be woven into textiles. The protein fiber of silk is composed mainly of fibroin and is produced by certain insect larvae to form cocoons. The best-known silk is obtained from the cocoons of the larvae of the mulberry silkworm "Bombyx mori" reared in captivity (sericulture). The shimmering appearance of silk is due to the triangular prism-like structure of the silk fibre, which allows silk cloth to refract incoming light at different angles, thus producing different colors. Silk is produced by several insects; but, generally, only the silk of moth caterpillars has been used for textile manufacturing.