22+Fabulous Blue Black Hair Color Ideas in 2019. The Blue, Black is elegant hair color. It is similar to the unusual color of blue, black, but particularly in the various lights. Celebrities such as Rihanna and Katy Perry rocked the blue and black. We believe that you will love this color, if you do not advance! So we have 23 of the most beautiful blue color black hair ideas. You will find the elegant dark color blends styles and more. Take a look and you will not be able to choose to try first!