Death (kurofujo, or black impurity), menstrual blood (akafujo, or red impurity), and childbirth (shirofujo, or white impurity) had been considered to be impurities hated by deities and had been avoided.
死（黒不浄）、経血（赤不浄）、出産（白不浄）は神様が嫌う不浄として避けられてきた。