Lord of the Flies

That would be war paint (face paint), or as Jack calls it "dazzle paint".

Here Sam and Eric were waiting, and Bill. Jack, concealed from the sun, knelt by the pool and opened the two large leaves that he carried. One of them contained white clay, and the other red. By them lay a stick of charcoal brought down from the fire. Jack explained to Roger as he worked. “Theydon’tsmellme. Theyseeme, Ithink. Somethingpink, underthe trees.” He smeared on the clay. “If only I’d some green!” He turned a half-concealed face up to Roger and answered the incomprehension of his gaze. “For hunting. Like in the war. You know—dazzle paint. Like things trying to look like something else—”