The Teaching of Aisha (RA) on Yellow Discharge
In a ḥadīth found in the Muwaṭṭaʾ of Imām Mālik, the maid servant of the Mother of Believers ʿĀʾisha (RA) reported an important teaching about yellow discharge:
"Women used to send small boxes to ʿĀʾisha, the Mother of the Believers, that had a piece of cotton cloth (kursuf) contained in them in which there was a yellow discharge upon it from menstrual blood. They would ask her about the prayer. She would say to them, 'Do not be hasty (to take a ghusl) until you see a white discharge.' By that she meant purity from menses." (Muwaṭṭaʾ, 85)
This hadith establishes that yellow discharge is considered menstrual blood, and women should not rush to perform ghusl after periods until they see white discharge, which indicates purity.