Avoid washing or scrubbing the brows directly, especially in the first 24 hours after application, and try to avoid the brow area when using cleansers, toners, and moisturisers. The application consists of using a high quality henna powder mixed with water that is carefully brushed onto your brows. The powder darkens your hair by blocking the light from reaching the scalp while also providing nutrients to the hair follicles. Henna has been used for centuries as a natural dye for skin and hair. It is safe for all skin types but it may cause an allergic reaction in some people. Henna has been linked to cases of contact dermatitis and asthma attacks but these connections are not known to be caused by any particular ingredient in henna. Henna is made up of several chemicals including alcohol, flavonoids, tannins, and salicylic acid. These ingredients help cleanse and treat the skin. People who use cosmetics containing henna should be aware that they can wear them until they crack or flake off. This exposure allows other products to be applied without interfering with the coloration of the henna brows. Once applied, henna stays dark for up to seven days if not washed away. Washing your face too soon after applying henna could remove the darkened pigment from your eyebrows. This can affect how you look and feel about yourself.