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Black hair
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.〔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)〕 Sometimes very dark brown (blackish-brown) hair is mistaken for black. 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 light skin tones to dark skin. Black-haired humans can have dark or light eyes.
==Distribution==
Outside of Europe, the majority of humans have black hair.〔National Geographic. See also Blond for more information on the origins of blond hair.〕 This is likely the original hair color of ''Homo sapiens'', and is found in its greatest distribution in Africa, Asia, and the pre-Columbian Americas. Black hair is also particularly common in people of Asia, Southern Europe, parts of South America and 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 hair, 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 sometimes known as the "Black Irish".〔http://books.google.com/books?id=fzyZNR-A68QC&pg=PA5&dq=black+irish+dark+hair&hl=en&ei=engSToi-Koa40AH2xZCkDg&sa=X&oi=book_result&ct=result&resnum=2&ved=0CC8Q6AEwAQ#v=onepage&q=black%20irish%20dark%20hair&f=false〕 Though this characteristic can be seen in people throughout the United Kingdom, it becomes more common in parts of Central, Southern and especially Eastern Europe.〔(The Distribution of Anthropological Traits in Europe ) , Bertil Lundman : ''The Races and Peoples of Europe'' (New York 1977)〕
Dark haired people, ranging from dark chestnut and deep brown to black, with either dark or light colored eyes can also be seen among the Indo-European and non-Indo-European ethnic groups in Iran, the Caucasus, Central Asia, Afghanistan, and North India.〔()〕〔(【引用サイトリンク】title=The Races of Man and Their Distribution )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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