Mehndi ceremonial art form which originated in ancient India.
Intricate patterns of mehndi are typically applied to brides before wedding ceremonies. The bridegroom is also painted in some parts of India. In Rajasthan, the grooms are given designs that are often as elaborate as those for brides.
Muslims in India also started to use it as an indication of coming of age. Henna is now also used in some Gulf States, where the night before the wedding night is dedicated to decorating the bride with henna, and called "Henna night". In the Middle East and Africa, it is common for women to apply henna to their fingernails and toenails and to their hands.
Likely due to the desire for a "tattoo-black" appearance, many people have started adding the synthetic dye p-Phenylenediamine (PPD) to henna to give it a black colour. PPD is extremely harmful to the skin and can cause severe allergic reactions resulting in permanent injury or death.
Henna paste is usually applied on the skin using a plastic cone or a paint brush. After about 15–20 minutes, the mud will dry and begin to crack, and during this time, a mixture of lemon juice and white sugar can be applied over the henna design to remoisten the henna mud so that the henna will stain darker. The painted area is then wrapped with tissue, plastic, or medical tape to lock in body heat, creating a more intense colour on the skin. The wrap (not a traditional method), is worn for 3 to 6 hours, or sometimes overnight and then removed. When first removed, the henna design is pale to dark orange in colour and gradually darkens through oxidation, over the course of 24 to 72 hours. The final color is reddish brown and can last anywhere from one to three weeks depending on the quality and type of henna paste applied, as well as where it was applied on the body (thicker skin stains darker and longer than thin skin). Moisturizing with natural oils, such as olive, sesame seed, or coconut, will also help extend the lifetime of the stain. Skin exfoliation causes the henna tattoo to fade.