Something that is blue-black is bluish black in colour.

Is blue black a color?

Blue black hair is a blend or combination of black and blue tones. The blues and blacks are often blended together to give a midnight blue color or, blue highlights are added to black hair.

Is black a Colour yes or no?

Black is the absence of light. ... Some consider white to be a colour, because white light comprises all hues on the visible light spectrum. And many do consider black to be a colour, because you combine other pigments to create it on paper. But in a technical sense, black and white are not colours, they're shades.