Hadith 646
´It was narrated from Umm Bakr that:` She was told that 'Aishah said: "The Messenger of Allah said concerning a woman who sees that which causes her doubt (i.e. some bleeding) after she becomes pure: 'That is a vein or veins.'" (Da'if)"What was meant by 'after becomes pure' is after having a bath (following the end of her period)."
Hadith 647
´It was narrated that Umm 'Atiyyah said:` "We did not think anything of the yellowish or brownish discharge." (Sahih) (Another chain) It was narrated that Umm 'Atiyyah said: "We did not think that the yellowish or brownish discharge counted for anything." Muhammad bin Yahya said: "Wuhaib (who narrated the second version) is the better of them with this according to us."