Shoe no nyonin' (a women in blue cloth) in the reading of a family register of deaths in Shuni-e (Omizu-tori or Sacred Water-drawing Festival) or 'blue flag' in the makurakotoba (a set epithet) of Mt. Katsuragi and so on, the meaning of 'blue' is worth of considering.
修二会の過去帳拝読で読まれる「青衣の女人（しょうえのにょにん）」や、葛城山の枕詞（木幡、忍坂山等にも掛かる）の「青旗」等、「青」の意味を考える価値はあると考えられる。