What is the ruling on the discharge of yellow fluid after a period of dryness, and what should be done in this situation? Is it obligatory to purify oneself every hour, acting upon the saying of Ibn Abbas: "If she sees purity for an hour, she should perform ghusl and pray"? And what is the duration after which the cessation of yellowness is considered purity?

Yellowish or brownish discharge is considered menstruation if it occurs during the habitual period or is connected to blood. If a woman sees purity, then sees yellowish discharge after her habitual period has ended, it is not considered menstruation. However, if it occurs during her habitual period, she must perform ghusl (definition) (ritual bath) when she sees purity. Then, if she sees blood, or yellowish, or brownish discharge during her habitual period, she reverts to being in a state of menstruation, and there is no specific duration for this, according to the more authoritative opinion.