How is the duration of menstruation calculated for a woman who cannot distinguish her blood?

The questioner : If she has no means of distinguishing it, because all her blood is black, or all red, or all thick, or all thin, or something similar, what does she do?

The Shaykh : She reverts to the usual custom of most women.

The questioner : How much? Seven and six to.

The Shaykh : Hmm?

The questioner : Seven days or six.

The Shaykh : Six days or seven. All right. No. From which day does it start? If we say that the usual custom of most women is six days or seven, then from the very beginning, from the start of the month, from the middle of the month, from the end of the month, from the first time the blood reached her. All right. Bashar. Except, if Allah wills. Ha, what Allah willed, what Allah willed. She is not.

The questioner : Of course, I have a second matter.

The Shaykh : All right, if we start, do you have knowledge of it? All right, you make the first day the start of menstruation. If you do not know it, we estimate it, so from the first day of every lunar month. I mentioned this to you, but there is no harm.