Namely
Shellac or shellac is a resinous material obtained from the secretions of a specific insect species: an Asian scale called Kerria lacca. It is used in cosmetics in hairspray, eyeliners and mascara.
Its functions (INCI)
Binding agent : Allows the cohesion of different cosmetic ingredients
Emollient : Softens and smoothes the skin
Film forming : Produces a continuous film on skin, hair or nails
Hair fixing : Allows hair style control
Viscosity controlling : Increases or decreases the viscosity of cosmetics