"palms of their slender hands tinted with henna"
Henna applied to the hand
GNU Free Documentation LicenseHenna applied to the hand - Credit: Divyashree

The application of henna to the hands as a form of decoration is known as Mehndi and is commonly applied during weddings or festivals in South Asia.  It is thought to have originated in India as a ceremonial art form, with Mehndi being applied to a bride's hands and feet prior to the marriage ceremony.