They have several factors that determine hair color such as melanin containing iron and sulfur. If melanin is missing, hair will be white or grey. Stem cells located in the dermis are responsible for producing hair. The shape and structure of the hair follicle determine 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 cut off. The telogen phase is the final phase also known as the resting phase, which lasts about three