Clarisse is associated most often with the color white. Her face is twice compared to milk: the first time Montag thinks of it as "milk-white," and the second time as like "milk crystal." Her dress is white, and her face is described as white as well as milky. Because of the way Bradbury uses color imagery, Clarisse seems lit up, glowing, soft, and translucent, especially as her whiteness is seen in contrast to the night when Montag first meets her.
She is also associated with the color violet: her eyes are likened to "two miraculous bits of violet amber."
These colors show Clarisse as she is perceived by Montag. She is a form of gentle light to him, likened to a glowing candle. She shines like a white light in a dark world.