Is the transparent fluid tinged with pink, or that which contains a red streak after the cessation of the menstrual period and the discharge of clear, pure transparent fluid, considered part of menstruation or irregular bleeding (istihadah), and is ghusl (ritual bath) obligatory for performing prayers that occur during the intermittent discharge of this fluid?

The recurring blood is considered menses as long as it falls within the possible duration of menstruation. Therefore, the woman must refrain from prayer, fasting, and all other things that a menstruating woman refrains from. When she sees purity from this recurring blood, either by dryness (al-jufūf) or by the white discharge (al-qaṣṣah al-bayḍā’), she must promptly perform ghusl (ritual bath) and pray. Some scholars hold that seeing dryness for a short period is not given consideration, but the relied-upon opinion (al-muftā bihi) is the obligation to perform ghusl if she sees purity, even if only for an hour.