Alqamah bin Abi Alqamah narrates from his mother, who was the freed slave-woman of the Mother of the Believers Aishah (may Allah be pleased with her), that she said that Sayyidah Aishah (may Allah be pleased with her) said: Women used to send me small boxes containing cotton on which there was yellowness from menstrual blood, and I would say: Do not be hasty until you see the clear white discharge.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحيض / 1589
It is narrated from the daughter of Zayd bin Thabit (may Allah be pleased with her) that women would call for lamps in the middle of the night so that they could look for their purity, and she would find fault with them for that and say: Women did not use to do this (that is, she did not approve of this practice of the women).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحيض / 1590
It is reported from Sayyidah Aishah (may Allah be pleased with her) that she used to forbid women from examining their menstruation at night, and she would say that sometimes there is yellowness and sometimes murky discharge.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحيض / 1591
Fatimah bint Muhammad (may Allah be pleased with her), who was brought up in the care of Amrah (may Allah be pleased with her), says that a woman of Quraysh sent Amrah (may Allah be pleased with her) a piece of cotton (I think he meant: with yellowness on it), asking her whether, when a woman sees nothing of the menstruation except this yellowness, she has become pure. She said: No, not until she sees pure white.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحيض / 1592
It is narrated from Sayyidah Asma' (may Allah be pleased with her): We were in her care along with her brother's daughters. One of us would become pure, then pray, then relapse with a little yellow discharge. She would ask her about it, and she would say: Keep away from the prayer as long as you see this (yellowness), until you see pure white.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحيض / 1593
(a) It is narrated from al-Hasan (may Allah have mercy on him) that when a woman sees a slight trace (of discharge), she should refrain from prayer, for it is menstruation.
(b) It is narrated from Abu Salamah (may Allah have mercy on him) that when a woman sees a slight trace (of discharge), she should look to the days in which she used to menstruate, and refrain from prayer only in those days.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحيض / 1594