Mix the henna powderHenna comes in a powdered form, and you must mix this with water before you can apply it to your hair. Mix ½ cup (50 g) of henna with ¼ cup (59 ml) of warm water. Stir to combine. | Shampoo, then dry your hairBefore applying henna, you'll want to start with clean hair. In the shower or bath, wash your hair with your regular shampoo to remove dirt, oil, and styling products.[1] Rinse out all of the shampoo. Once out of the shower, towel dry, blow dry, or air dry your hair. | Apply to hairStarting with the topmost layer of hair, grab a thin 2-inch-wide (5-cm-wide) section of hair from the middle back of your head. Comb this section away from the rest of your hair. | Rinse with conditionerWhen the henna has had enough time to set, put your gloves back on and remove the plastic wrap. Hop in the shower and thoroughly rinse the henna paste from your hair. Rub conditioner into your hair to help loosen the paste. |