It is narrated from Sayyidah Umm Atiyyah al-Ansariyyah (may Allah be pleased with her), who had pledged allegiance to the Prophet (peace and blessings be upon him), that she said: "We did not consider the brownish and yellowish traces after the ritual bath (ghusl) to be anything."
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 21614