Found in various literature of the early Heian period, the color is the same as the 'aoshira-tsurubami' (grayish Surrey green color) and also called as 'aoiro' (blue) and 'yamabatoiro' (grayish Surrey green color).
平安時代前期の文献に散見する「青白橡」（あおしろつるばみ）と同色とされ、「青色」、「山鳩色」とも呼ばれた。