Why people have different colours of hair.

In addition to corneous protein,a small amount of water and fat,hair contains more than ten metallic element,such as sulphur,carbon,phosphorus,calcium,iron,lead,zinc,copper,manganese and cobalt.The colour of the hair is determined by the amount of these various elements.if the hair contains more than the usual amounts of copper and iron,the hair will be black.If the hair contain a lot of titanium,it will be blond,if their is a lot of molybdenum in the hair,MU be dark-brown,and if the hair contain a lot of copper,iron and cobalt,the hair will be reddish-brown.