indigo blue

This color is dyed using tate indigo, which was introduced from China. Indigo is known as the oldest dye known to mankind. Ai" is also used as a generic term for the color of indigo dyeing. The color "bb-iro" is also dyed with indigo, and both "ai-iro" and "bb-iro" have multiple color names, each named according to the intensity of the color, making them a group of color names. While "bb-iro" is a color dyed only with indigo, "ai-iro" is a color dyed with yellow barracuda. The English name is "indigo.