The Best How Long To Leave Loreal Hair Dye In Ideas. Before coloring your hair, protect your clothes by wrapping a towel around your neck and shoulders. For the greatest results and to prevent needless hair damage, be sure to know how long to leave hair dye in.
For resistant gray hair, leave on for extra 10 minutes. Web permanent dye is the longest lasting dye. Apply haircolor mixture immediately to dry, unwashed hair.
