Tips for Mehendi.

Do’s
Wash the area to be decorated with a good soap (one with a mud base) and water. 
Mehendi should be kept for 2-3 hours till it is fully dry.
Scrape off the dry Mehendi and do not wash it with water for at least 24 hours, to ensure maximum color.
Apply a mixture of lemon and sugar, at least twice, to the dry area.
After the tattoos are dried completely get some steam passing through cloves over the gas and apply Vicks for a good darkened color.
When the Mehendi starts fading and appears patchy, it can be removed by applying cosmetic body bleach.

Dont’s

Do not use an oily soap as this can prevent the color from setting properly
After the tattoos are applied avoid washing the area with soap or water
Avoid staying close to the air conditioner as it dries up the mehendi.

Mehendi Tips for better results!

You should leave the mehendi to dry on your skin and keep it on for as long as possible (10 – 12 hours if possible – you can go to bed with it). Scrape it after that. The color will become deeper
if you leave it untouched by water for another 10 – 12 hours. A deep color may last up to two weeks. The coloration varies from person to person.