Chapter on the Rules of Menstruation, Istihadah, and Nifas, and Purification From Them

The statement "nor should they become junub while having dye applied" means that if someone became junub previously and has not yet performed ghusl, they should not enter a second state of janaba while the dye is still applied, until they first perform ghusl for the initial janaba. As for the implications of these narrations, they indicate karaha (dislike) rather than tahrim (prohibition).