Henna is used pretty extensively to decorate women’s hands during weddings in India. It’s called Mehindi in India
At the mehndi ceremony, the future bride has her hands and feet intricately patterned with a paste which is a recipe of henna, oil, lemon juice and some water tinted with tea. The application of mehndi or henna takes about four hours to complete. Ideally, the bride-to-be should not wash her hands until the paste has completely dried.
Mehndi has great significance in all Eastern wedding traditions, and no wedding is complete without the decoration of the bride’s hands and feet – in many cultures on both the front and back of the hands right up to the elbow, and on the bottom half of the legs. The mehndi night is something like a hen night in the West, with all the bride’s female friends and relatives getting together to celebrate.
Mehndi signifies the strength of love in a marriage. The darker the mehndi, the stronger the love.
How it’s applied – freehand using what looks like a cake icing bag: Here