Holistic Chick: Tricks of the Trade - Using Tea as a Natural Hair Dye! All you need is about 3 tea bags or the equivalent in loose leaf tea. You'll need about 2 cups of water and bring the whole mixture to a boil. Allow to boil for 3-5 minutes then let it cool. Apply to hair and let sit for about 1 hour (or more) before rinsing it out.