Collodions

Collodions are the liquid preparations meant for external
application to the skin. They are convenient applications for
small cuts and abrasions and are also used when a prolonged
contact between the skin and the medicament is required. The
vehicle used is volatile and evaporates on application to skin,
leaving a flexible, protective film covering at the site of
application. They are applied with a brush or rod.
Flexible collodion contains pyroxillon, castor oil and alcohol
in solvent ether. Alcohol and solvent ether are used as vebhicle,
pyroxillon as film producing agent and castor oil gives
gives flexibility.http://hpsssb.hp.gov.in/