They have several different factors that determine hair color, such as melanin containing iron and sulfur. If there is a lack of melanin, the hair will be white or gray. Stem cells located in the dermis are responsible for hair production. The shape and texture of the hair follicle determines an individual's hair. The hair growth process goes through the following three phases. The anagen phase which lasts about twenty-eight days and grows by about one centimeter. The catagen phase lasts about two to three weeks and the blood supply to the hair is interrupted. The telogen phase is the final phase also called the resting phase, which lasts about three