Have you ever wondered why your grandparents have grey hair? And eventually you see your parents hair turning grey too. It seems to be a sign of aging. That is the reason why people tend to cover up their grey hair by dyeing. Hair is a part associated with skin. The colour of your skin is due to the colouring pigments. There are five pigments responsible for the colour of skin. Melanin is the important pigment of all these Melanin is brown colour pigment. It is responsible for the colour of skin, hair and eyes. They are produced by melanocytes.