<P> 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 . </P>
where does the material to make silk fabric come from
cocoons of the larvae of the mulberry silkworm Bombyx mori