Study Niddah folio 21A with parallel Hebrew-English text, traditional commentary, and modern study tools. Free access to Babylonian Talmud online.
For the purposes of the examination of blood, the wine of the Sharon region in Eretz Yisrael has the same status as undiluted Carmelite wine and not diluted Carmelite wine, new Carmelite wine and not old Carmelite wine.
Rav Yitzḥak bar Avudimi says: And in all cases of blood that has the color of diluted wine, one examines blood only with a simple Tiberian cup. The Talmud asks: What is the reason? Abaye says: Containers are designed according to a universal standard, such that a cup that can contain a log of wine
Mishnah: In the case of a woman who discharges an amorphous piece of tissue, if there is blood that emerges with it, the woman is ritually impure with the impurity of a menstruating woman. And if not, she is pure, as she is neither a menstruating woman nor a woman after childbirth. R' Yehuda says
In the case of a woman who discharges an item similar to a shell, or similar to a hair, or similar to soil, or similar to mosquitoes, if such items are red, she should cast them into water to ascertain their nature: If they dissolved, it is blood, and the woman is impure with the impurity of a