The present invention provides a post-application expanding composition for application to keratin fibers, preferably hair, more preferably the hair of the scalp, eyebrows and eyelashes, and most preferably the eyelashes. The composition comprises one or more surfactants, a solvent for the surfactant(s), a volatile agent, a film forming agent and, optionally, a colorant, preferably a pigment. The present invention also provides a method for imparting a volumizing effect to hair of the scalp, eyebrows or eyelashes by applying thereto the post-expanding composition of the invention.
