Brunette refers to hair that is a shade of brown. While black hair can appear dark brown in certain lighting, it's considered a distinct hair color on its own.
Here's a breakdown:
* Black hair: Has a high concentration of eumelanin pigment, resulting in a very dark color.
* Brunette hair: Has a mixture of eumelanin and pheomelanin pigments, resulting in a range of brown shades from light to dark.
Therefore, black hair falls outside the spectrum of brunette hair colors.