Silk is the fibrous protein obtained from cocoons of the silkworm Bombyx mori.

What it is used for and where
Cosmetics  
Bulking agent. It regulates the water content, dilutes other solids, can increase the volume of a product for better flow, acts as a buffer against organic acids, helps to keep the pH of the mixture within a certain level.
Synonyms:
Trade name:

CAS: