The dark and yellow discharge and the white cotton in menstruation?

Question : In the name of Allah, the Most Gracious, the Most Merciful. Honorable Shaykh, we ask you to clarify for us the dark and yellow discharge, and whether its ruling is the same as that of menstruation? Then what is the white cotton? And is it necessary to know the end of the blood by it so that the woman performs the ritual bath, or not?

Answer : In the name of Allah, the Most Gracious, the Most Merciful. The dark and yellow discharge. It is a fluid that comes out of the woman, changed to a dark color, such that it is like the washings of meat, meaning reddish, but its redness is not distinct. As for the yellow, it is yellow water that comes out of the woman. The scholars differed on this yellow and dark discharge in five opinions. But the closest of the opinions is:
that what is connected to the menstruation is part of it, as long as its duration does not extend, and what is not connected to the menstruation is not part of it. As for the white cotton:
what is meant by this is that if a woman places cotton in the place of the discharge, it does not change; it comes out white. If it changes, this is evidence that the blood has not stopped. Some women do not have a white cotton, meaning the dark discharge is constant for them from one period to the next. For these women, the sign of their purity is the cessation of the blood, even if the yellow remains, because they do not have a white cotton. In reality, the issues of menstruation are among the most difficult issues at times regarding what happens to women. As for the normal woman, there is no difficulty in her menstruation. Most of the difficulty arises from the use of medications, meaning the pills that women take. These pills, in addition to being harmful to the uterus, cause many difficulties for the woman and for the scholars she consults. Therefore, I warn women against using these pills, especially the woman who has not married, because some doctors have told me that using these pills leads to sterility, meaning she becomes barren and does not give birth. There is no doubt that what prevents nature, its result is certainly the opposite. Menstruation is a natural blood. If something is eaten or used that prevents it from its nature, it must have a reaction on the body, because it has altered the body and twisted it away from the nature in which Allah the Mighty and Majestic created it. So, I warn women against using these pills.