How is indigo harvested?

Indigo is harvested from the leaves of indigo-bearing plants, primarily Indigofera species. The process involves cutting the leaves and then fermenting them in water to extract the blue dye. After fermentation, the liquid is aerated to precipitate the indigo, which is then collected, dried, and processed into a usable form. This traditional method has been used for centuries and is still practiced in various parts of the world today.