0_Apprentice
My hair is black. What color is your hair?
1_Wizard
I have black hair, too! It's probably because it's the most common of all human hair colors across the entire globe. We're just a part of larger populations that have this dominant trait!
0_Apprentice
If you could change your hair color, what would it be?
1_Wizard
I probably wouldn't. I'm happy with black hair. Although, hair coloring is definitely on the rise, as 75% of women and 18% of men in Copenhagen, for example, have reported dying their hair, if that gives you any indication.
0_Apprentice
I might dye my hair later in life, as my black hair is beginning to grey out. Would you?
1_Wizard
I'm not so sure. But I understand if you would want to, in order to stand out. Especially if you lived in Asia, Eastern Europe, Latin America, Southern Europe, or Africa, no matter what your ethnolinguistic affiliation, you most likely have black hair as it's overwhelmingly common. 
0_Apprentice
While I do have black hair, most people around here in my area of the United States seem to have brown hair instead.
1_Wizard
Ah, that's interesting. And even though you have black hair, you can still be quite different. The range of skin colors that go along with black hair is still really vast, as you can have either the palest of light skin to the darkest tones of dark skin. It's a wide spectrum, so there's still variability in appearance.