Black hair is the darkest and most common of all human hair colors globally. It is a dominant genetic trait, and it is found in people of all backgrounds and ethnicities. It has large amounts of eumelanin and is less dense than other hair colors. Black hair is known to be the shiniest of all hair colors. Black hair can be slightly rufous, soft black, or blue-black. Sometimes black hair can appear to shine silver-blue in the sun. In English, black hair is sometimes described as "soft-black", "raven black", or "jet-black". The range of skin colors associated with black hair is vast, ranging from the palest of white skin tones to a tan olive complexion to dark brown skin. Black-haired humans can have dark or light eyes.
Outside of Europe, the majority of humans have black or dark brown hair. This is likely the original hair color of Homo sapiens, and is found in its greatest distribution in Sub-Saharan Africa and South Asia. Black hair is also particularly common in people of Southern Europe, West Asia, and North Africa, regardless of ethnolinguistic affiliation. It is notably concentrated among Celtic peoples of Europe. For example, the western Irish are particularly noted for their curly, very dark brown to jet-black hair combined with either dark (such as brown) or light (such as green, gray or blue) colored eyes. Irish people with these traits are known as the "Black Irish". This characteristic can be seen in portions of British people throughout the United Kingdom. Black haired people with either dark or light-colored eyes can also be seen among the Indo-European ethnic groups of Central and West Asia; including Iran, Afghanistan and North India.. Black hair is very scarce in the Baltic littoral.
Black hair comes in a variety of textures. Straight black hair is the common texture in East Asians and Native Americans. It is known that 45% of Europeans have straight hair, 40% wavy hair and 15% of people from Europe, more common in Southern Mediterranean regions, have curly hair. Kinky or curly black hair is common among people of African descent. And curly or wavy black hair is common in South Asia.
Brazilian model with black hair
A Circassian woman, their black hair was once considered to be an ideal of beauty.
See also 
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- Frost, Peter. "Why Do Europeans Have So Many Hair and Eye Colors?" (summarizing Frost, P. 2006. European hair and eye color - A case of frequency-dependent sexual selection? Evolution and Human Behavior 27:85-103)
- National Geographic. See also Blond for more information on the origins of blond hair.
- Day, John V. (Fall 2002). "In Quest of Our Linguistic Ancestors: The Elusive Origins of the Indo-Europeans" (PDF). The Occidental Quarterly 2 (3): 5–20. Retrieved 2010-05-08.
- Why do some people have curly hair?'”.