Melanins are naturally occurring pigments found in animals and plants. They are complex heterogeneous polymers whose chemical structure has not been satisfactorily determined [1-2]. There are two major classes of natural melanins, the black-brown eumelanin found in human black hair and in the retina of the eye and the yellow-red pheomelanin found in red hair and red feathers [1,3]. Two biological functions of melanins have been identified. First, they have been shown to increase optical efficiency of the eye, and secondly, they are responsible for the production of color patterns in hair and superficial epidermis [1].