Start with dry, unwashed hair for best results. Mix the color formula and developer according to the instructions provided in the kit. Section your hair to ensure even application, then apply the mixture starting at the roots, working your way through to the ends. Use a comb or fingers to distribute the color evenly. Leave the color on for the recommended time specified in the instructions, usually around 30 minutes. After processing, rinse your hair thoroughly with warm water until the water runs clear, then shampoo and condition as directed. Style your hair as usual to reveal vibrant, long-lasting color.