In arguments things can be black or white, or shades of grey, as the color intensity can be used as an analog for things such as truthfulness.
Black is often used in painting and film to express the unknown or death.
The term black is also used for people with dark skin color. For eaxmple, in the USA, African Americans
Black Army: a supporter club for AIK?, Stockholm, Sweden.
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Was "black" an official category in apartheid South Africa?