You should bleach it first. Well, it really depends on what color you want it, but usually you bleach it. I don't recommend bleaching black hair though, because bleach damages black hair more than any other color. You may never get it back to your natural color.
Her natural hair color is a dark brown or black if you see her sister she has black hair and so does Nikki Dee.
his hair color is black. doy
Selena Gomez's natural hair color is black.
Black
Vanessa Hudgens natural hair-color is black.
She had black hair.
His natural hair color was medium blond, but he died his hair black later in his life.
It is black
It's natural brown/black
There is no natural way to change hair color. To change it you have to dye it or get a wig in the color you want.
The natural color is dirt blond but he dyes it black.
In his teenage years he had brown hair now he have black hair as an adult