What is "lightener"

Usage examples of "lightener".

Then as though listened for herself she reached the telephone and raised it silently, there was only the dial tone, and she placed it as carefully back, exchanging a glance with the mirror which she recovered in arch detail down the hall, bent so close over the bathroom basin that her eyes' dark circles deepened until hidden under daubs of a cream lightener, the fullness of a lip modified, eyelids lined with the faintest of green and the hair punished, drawn, tossed free again before she came down the stairs.

The servitor had already added the proper amounts of lightener and sweetener.