1 If necessary, bleach hair to a light/platinum blonde. Do not condition hair if you are coloring your hair right away.
2 Section hair using ponytail holders. You can do this any way you like.
3Using a highlighting wand or small hair color brush, thoroughly apply the color without letting it touch other sections. Wrap in plastic rap or tin foil if desired. Remember, the rainbow is red, orange, yellow, green, blue, indigo, violet.
4 Wait anywhere from 30 minutes to three hours. You can apply heat every once in a while to help the color set in.
5 Rinse out one section at a time to prevent bleeding, and put a conditioner on your hair.
6 Dry your hair and enjoy your rainbow!