The dark brown membrane of the eye is the choroid, it contains many blood vessels and supplies the eye with nutrients.
choroid - a highly vascular membrane in the eye between the retina and the sclera; a dark pigmentation minimizes the scattering of light inside the eye.(http://www.thefreedictionary.com/choroid)
His hair is dark brown but the tips are lighter. His eyes are dark brown.
Dark brown
Zayn has really REALLY dark brown hair.
dark brown
dark brown
Yes brown is a dark color
Brown
if its a light brown and black then its a really dark brown together if its a dark brown and black its just black or a brown you cant notice that's its a verry dark brown
she has dark brown eyes :) hi
dark brown
Given the part of the world he was from, that would have been highly unlikely. Most probably he had dark hair and brown eyes.