Here's my before picture. I had burgundy hair but you this tutorial will work with pretty much any warm colored hair. Be careful though if you have cool colored hair like a platinum blonde or ash brown. Blue black hair dye can turn your hair green!
For my blue black hair, I used L'Oréal Paris Féria in Starry Night (#21) and Splat in Blue Envy. The Féria dye is a really great blue black on its own, but to up the ante a little, I made my dye more blue. As for the blue dye, you can use anything from Manic Panic to Directions to Special Effects. I decided to use Splat because that's the most readily available brand in your neighborhood drugstore.
Begin by making sure to wear stylist gloves (they come with your hair dye), a raggedy old T-shirt, and a towel on your shoulders for good measure. Then in a bowl, mix the Shimmering Conditioning Developer Crème (2) with the Aromatic Shimmer Serum (3).
Now, for the color!
Add about a tablespoon of Splat blue dye as well as the Féria Shimmering Conditioning Colour Gel (1). Mix thoroughly!