[Machine] The Messenger of Allah ﷺ said: "The blood of menstruation is black and thick, with a red tint on top, while the blood of istihada (irregular bleeding outside of menstruation) is yellow and thin. If the red tint of menstruation prevails, then let her refrain from prayer. If the yellow tint of istihada prevails, then she should place a cloth so as to prevent it from ruining her prayer. If it prevails during prayer, she should not interrupt her prayer. If drops come while her husband is with her, she can still fast and pray." Abdullah ibn Ka'b al-Qurazi reported this narration, and al-Ala is the son of Kathir, who is considered weak in narration. The hadith is also makhul, meaning he did not hear anything from Abu Umamah. Allah knows best; Abu Bakr ibn al-Harith al-Faqih informed us about this, from Abu al-Hasan al-Daraqutni, who is a hadith scholar.  

قَالَ رَسُولُ اللهِ ﷺ فَذَكَرَ الْحَدِيثَ قَالَ وَدَمُ الْحَيْضِ أَسْوَدُ خَاثِرٌ تَعْلُوهُ حُمْرَةٌ وَدَمُ الْمُسْتَحَاضَةِ أَصْفَرُ رَقِيقٌ فَإِنْ غَلَبَهَا فَلْتَحْتَشِ كُرْسُفًا فَإِنْ غَلَبَهَا فَلْتُعْلِهَا بِأُخْرَى فَإِنْ غَلَبَهَا فِي الصَّلَاةِ فَلَا تَقْطَعِ الصَّلَاةَ وَإِنْ قَطَرَ وَيَأْتِيهَا زَوْجُهَا وَتَصُومُ وَتُصَلِّي عَبْدُ الْمَلِكِ هَذَا مَجْهُولٌ وَالْعَلَاءُ هُوَ ابْنُ كَثِيرٍ ضَعِيفُ الْحَدِيثِ وَمَكْحُولٌ لَمْ يَسْمَعْ مِنْ أَبِي أُمَامَةَ شَيْئًا وَاللهُ أَعْلَمُ أَخْبَرَنَا بِذَلِكَ أَبُو بَكْرِ بْنُ الْحَارِثِ الْفَقِيهُ عَنْ أَبِي الْحَسَنِ الدَّارَقُطْنِيِّ الْحَافِظِ