1. Since ancient times, leaves and stems have been used as indigo dyes, and seeds have been used in Chinese medicine for antipyretic and detoxifying. It was already transmitted to Japan through China during the Asuka period. Currently cultivated in Tokushima, Hiroshima, etc.
2. A kind of dyeing material made from indigo leaves. Dark blue natural dye.
And Japanese-indigo plant. RGB 63, 0, 255 / Hex #3F00FF / CMYK 75, 100, 0, 0 Japanese says Ai.