Henna paste is usually applied to the skin using a plastic cone.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 is worn for two to six 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.