Henna stains are orange when the paste is first removed, but darken over the following three days to a deep reddish brown.
Soles and palms have the thickest layer of skin and so take up the most lawsone, and take it to the greatest depth, so that hands and feet will have the darkest and most long-lasting stains.
The timing depends on the crop of henna being used.
Essential oils with high levels of monoterpene alcohols, such as tea tree, cajeput, or lavender, will improve skin stain characteristics.
Siddal was portrayed by Rossetti in many paintings that emphasized her flowing red hair.
The other Pre-Raphaelites, including Evelyn De Morgan and Frederick Sandys, academic classicists such as Frederic Leighton, and French painters such as Gaston Bussière and the Impressionists further popularized the association of henna-dyed hair and young bohemian women.
The henna mix must rest for 1 to 48 hours before use, to release the lawsone from the leaf matter.
This is considered sunnah, a commendable tradition of the Prophet Muhammad.
Furthermore, a hadith (narration of the Prophet) holds that he encouraged Muslim women to dye their nails with henna to demonstrate femininity and distinguish their hands from those of men.
To prevent it from drying or falling off the skin, the paste is often sealed down by dabbing a sugar/lemon mix over the dried paste, or adding some form of sugar to the paste.
After time the dry paste is simply brushed or scraped away.