Sayyiduna Abu Umamah al-Bahili (may Allah be pleased with him) says that the Messenger of Allah (peace and blessings be upon him) said: "The blood of menstruation is black and thick, with redness over it, and the blood of prolonged bleeding (istihadah) is yellowish and thin. If it overwhelms her, she should put a pad of cotton in place, and if it overwhelms her still, she should put another fresh one over it. If it overwhelms her during the prayer, she should not break off the prayer, even if it drips. Her husband may come to her (that is, have intercourse with her), and she fasts and prays."
This Abd al-Malik is majhul (unknown), al-Ala' is Ibn Kathir, who is da'if (weak) in hadith, and Makhul did not hear anything from Abu Umamah. And Allah knows best.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحيض / 1554