All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His slave and Messenger.
We have explained in many previous Fataawa that woman’s purification of menses is known with one of two signs: - (1) Al-Qassah Al-Baydhaa’ (i.e. the white discharge) and (2) dryness.
As for Al-Qassah Al-Baydhaa’, it is a white liquid that is discharged after menses. It resembles the water of mortar or the water of dough. As for dryness, it is fulfilled when the woman inserts a piece of cloth or a piece of cotton into her vagina and finds no trace of blood, or yellowish/brownish discharge. That is because woman’s vagina is usually moist.
As such, if you put a piece of cloth or cotton into your vagina and find no wetness (i.e. dry), so you are purified from menses; however, if you do so and find the trace of brownish/yellowish discharge, so you are not purified. Accordingly, do not hasten until you are purified from menses through realizing any of these two signs.
For more benefit on seeing white, reddish or brownish discharges after the end of menses, please refer to Fatwa 100850, 174955 and 231715.
For more benefit on vaginal discharges, please refer to Fatwa 413527, 450682, 429052, 409849, 370681 and 367930.
Allah knows best.