Though famously known as a body art ink, henna is a natural plant dye also commonly used to dye hair to shockingly strong shades of red and orange. Semi-permanent henna hair dye gives a rich color, but sometimes the effects can be too strong, unpredictable or just hang around longer than you want them to. For a natural means of fading fresh henna or removing old henna, take advantage of the natural proteins and fats in yogurt (just be sure to leave out the strawberries).
Wash your hair and fully dry it before you begin; this will remove all trace layers of product, dirt and grime that would get between the ingredients in the yogurt and the dyed hair.
Apply the yogurt to your head and massage it into place. Coat your hair generously from root to tip. Use as much as you can without having it drip out. Rub your hair with your fingertips for about a minute.
Stand bent over in the tub and comb the yogurt through the strands of hair. Comb from root to tip; much of the yogurt will get squeezed out of your hair and into the tub, but the combing will distribute the yogurt evenly and thoroughly among the hairs on your head.
Wrap your yogurt-soaked head of hair in kitchen plastic wrap; this will keep it moist and keep it from making a mess while you wait.
Wait for one hour to let the yogurt soak into your hair.
Wash the yogurt from your hair. Rinse thoroughly, then wash with a clarifying shampoo.
Dry your hair and repeat the process as needed to remove more dye.