A cartridge assembly for modifying a surface. The cartridge assembly has a body and a base, the body defines a reservoir having a standpipe. The reservoir contains a treatment composition pressure element. Between the treatment composition pressure element and the standpipe is the head space, and within the head space there is a treatment composition dispersing device. The cartridge assembly can be used in a device for analyzing and treating tonal imperfections on human skin. The device, or apparatus has an applicator comprising a head and one or more nozzles, preferably the nozzles are arranged in an array and are associated with the cartridge assembly for dispensing a treatment composition therefrom.
