If a woman sees a reddish or yellowish discharge after complete dryness, it will be regarded like the discharge of urine. She has to wash herself, clean her clothes and perform ablution before making prayers. This is based on the report of Umm Umm `Atiyah (may Allah be pleased with her) who said, “After we were pure, we did not consider the yellow or muddy discharge to be anything (i.e. of the menses blood).” (Al-Bukhari and Abu Dawud)

 

Allah Almighty knows best.