The most natural Indigo was obtained from the Indigo plant called Indigofera Tinctoria and is common in the tropics
Indigo was used in India which was the earliest center for its production and processing. Indigo is used mainly for blue jeans and is also used as a food colorant. Indigo powder is extracted from the leaves of the plant which is then put to many uses including colors. Indigo has been used to color hair alone or in combination with Henna to color hair black for at least 4000 years. It was a very common hair color in the 19th and the 20th century, especially in the US and Europe and was known as “Black Henna”.
However Henna is never black and can never color hair black, but Indigo powder does resemble Henna and does color hair black and so is called “BLACK HENNA”. It is the most prominent ingredient of our natural hair colors.