Leave mehndi for a longer time:
Wash off the henna after 7-8 hours. If you can afford to keep it longer, leave it for about 12 hours. Do not wash with water; instead, scrape it out by rubbing your palms together until the dried henna falls off! Within a few hours, you will see the rich color develop.
Dab lemon sugar mixture couple of times:
Boil some sugar in water and allow it to cool. Now decant this mixture into a bowl. Add a few drops of lemon juice and apply the lemon sugar mixture a couple of times on the henna once it has dried. The sugar keeps the mehndi in contact with the skin for deeper penetration, while the lemon juice acts as a catalyst for dye release and deep penetration of color.
Wrapping up the design:
Many also suggest wrapping the henna design as it gives a rich and darker color. While you can do the wrapping yourself, but there is a danger of spoiling the design. It is best you ask the artist to do so or have somebody else do it in her supervision. You can use medical paper tape to gently wrap up the mehndi.
Run your hands over the fumes of the cloves:
Try ‘bhaap’ for a splendid and rich penetration of the mehndi design on your palms. Before you hit the bed, first apply the lemon sugar mixture mentioned above. Now heat a few cloves over a tawa and run your hands over the fumes of the cloves, but carefully! Let the fumes dry up the lemon and sugar mixture. You can either scrape the henna off after this or leave it on until dusk.
Apply balms after scrapping the crust:
Indian brides use balms like Vicks, or Tiger Balm, on henna after scrapping the crust off. It is said that these balms stimulate color development and penetration into the skin.