How Do You Dye Your Hair Dark Blue?
To dye your hair dark blue, you need to bleach your hair first if your hair is dark. Then, you can mix a blue hair dye with developer according to the instructions on the dye package. Apply the dye mixture to your hair, making sure to saturate all the strands. Leave the dye on your hair for the recommended time and then rinse it off with cool water. Use a color-safe shampoo and conditioner to help the color last longer.