Overview: Deep indigo blue is a traditional Japanese color. It's an indigo dye that has been made using time-honored techniques passed down from generation to generation. See how dedicated craftsmen create the raw material for the dye from the fermented leaves of the Awa indigo plant, and how master dyers make deeply textured indigo color without using any chemicals. We follow the year-long process to produce this cherished dye, the culmination of centuries of craftsmanship.