Soncino English Talmud
Niddah
Daf 67a
R. Giddal citing Rab ruled: If a woman gave to her child some cooked food and then performed her ritual immersion and ascended from the water, her immersion has no validity, because, though there may be no food now, it may well be assumed that it had fallen off with the drippings. Rami b. Abba ruled: Scars constitute no interposition during the first three days; henceforth they constitute an interposition. Mar Ukba ruled: Pus within the eye constitutes no interposition when it is moist, but when it is dry it constitutes one. When is it called 'dry'? — From the time it begins to turn yellow. Samuel ruled: Stibium within the eye constitutes no interposition but on the outside of the eye it constitutes one. If a woman's eyes were twitching it constitutes no interposition even if it is on the outside of the eye. R. Johanan ruled: If a woman opened her eyes too wide or shut them too closely, her immersion has no validity. Resh Lakish ruled: A woman must perform immersion only when standing in her natural position; as we have learnt: A man is inspected in the same position as when he hoes or gathers olives; and a woman is inspected in the same position as when she weaves or suckles her child. Rabbah b. R. Huna stated, 'One knotted hair constitutes an interposition,