Indigo Seeds
Indigfera tinctoria
The true indigo used to produce the famous blue dye that for 4000 years was considered the most important dye stuff in the world. The leaves (strongest when in flower) contain indocan which must be fermented or steeped 12-48 hours to produce the blue dye. The leaves are used to deepen the blackness of black hair in India. The Chinese use the roots and leaves to treat swollen glands, heat rash and depression.