Henna kits for decorative body art are sold at Walmart, Michael's, Jo-Ann Fabric and Craft Stores, and online on Amazon and EarthHenna. Henna for coloring hair can be purchased at Walmart, Walgreens and online on Amazon.com.
Henna is a natural substance that's been used for centuries by many ancient cultures. Henna is known to have existed as far back as 5,000 years ago in India, where it is still used for wedding and religious ceremonies. The intricate designs that have become popularized by most henna users today are similar to those used for wedding ceremonies and other rituals.
Henna powder is found naturally in the Middle East, where it is derived from a bush called "Lawsonia inermis." Henna only leaves an imprint on the skin if the leaves from the plant are properly ground. In order to apply it to the skin, the powder is mixed with lemon juice, strong tea or other mildly acidic liquid to form a paste and is left on the skin for up to 10 hours.
Unlike other hair dyes, henna is non-damaging to the hair. It does not actually change the color of hair, but only coats the hair with color and applies shine. When henna is used as a hair dye, it is mixed with an acidic liquid to form a paste.