The repetition of colors in "Lord of flies" highlights a type and sensation that the author wants to convey to the reader. These colors are very associated with each sensation that is related and their competition intensifies that emotion.
In a nutshell, we can say that the colors within this narrative convey the following emotion:
Red: used to convey the feeling of danger, usually associated with violence or suspense.
Pink: used to represent agony and despair. It can be seen at the moment when Piggy's body is being consumed by hot water.
Blue and white: Related to betrayal and conspiracy.
