Well, first of all The Color Purple falls under the broadest genre of fiction. The three primary genres are poetry, drama, and fiction.
Hair color is determined by two different forms of pigment: eumelanin (which is the largest influence) and phenomelanin. Eumelanin is a black pigment, and phenomelanin is a red or yellow pigment. Hair color is determined by three factors having to do with pigments: how much pigment is present, to what degree a eumelanin or phenomelanin is present and how close together the melanin (pigment) granules are. The more eumelanin a person has, the darker his hair will be.
Jamie McCarthy/WireImage, Jordan Strauss/WireImage 2. 1. Identify Your Own Natural Hair Color Your natural hair color first determines where to start when you're choosing your desired shade, says celebrity colorist Sharon Dorram, who has worked with Julia Roberts, Kate Hudson, and Nicole Kidman.