What is the color of the white discharge (al-qassah al-bayda), and is the yellowish fluid the white discharge? And how is the cotton placed to ascertain purity?

You must insert the cotton and remove it immediately upon seeing purity. If it comes out clean, without any trace of blood, yellowness, or turbidity, then the woman has become pure. The white discharges are not taken into consideration because the vagina is rarely free of them, and the difference between white and yellow is clear. If the yellowness persists, then menstruation is still present. If white discharges appear, then she has become pure. One should disregard any obsessive thoughts, if they exist.