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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 India. Hair is naturally reflective, so black hair isn’t completely dark in bright light. However, the darkest shade is deep enough that it doesn’t give the reflection a warm, neutral tone. Instead, the sheen can seem almost blue, like the iridescence of a raven’s wing. Thus, it’s known as raven-black. [citation needed] It’s found in people of African, Latin American, South Asian and Southeast Asian descent. Black hair overwhelmingly predominates in almost all parts of Asia, although areas in Northwestern Asia (mainly Turkey, Cyprus, Lebanon, Israel, Georgia, and Armenia) have significant non-black haired populations.