How Do You Dye Grey Hair Blue?
To dye grey hair blue, first bleach strands to a pale blonde color to create an even base for the dye. After that, apply a blue semi-permanent hair dye evenly with gloves and a brush. Leave the color on for the recommended amount of time, usually around 30 minutes, and then rinse with cool water and apply a color-protecting conditioner. Reapply the dye as needed to maintain the blue color. It’s always a good idea to consult with a professional hairstylist before attempting to dye your hair at home.