Menstrual blood has its own characteristics which women know. It is dark and thick blood that comes on certain days of every month. When this bleeding ceases, the woman should do ghusl and resume praying, as she has become pure. If she sees a yellowish or brownish discharge, or blood that is different from menstrual blood, after the time of her usual menses has ended – and this is what is known as istihadah (irregular bleeding) – she should not regard it as being of any significance, and it is deemed to not be menses. This is what the Sahabiyyah Umm ‘Atiyyah (may Allah be pleased with her) was speaking of when she said: We used not to regard the brownish and yellowish discharge as being of any significance. What is meant in this hadith by yellowish and brownish discharge is discharge that a woman may see, which may resemble pus with its yellowish colour. If the woman sees that outside of the days of her usual menses – as is clearly stated in the report narrated by Abu Dawud – she should not regard it as being of any significance, because they did not regard it as coming under the rulings on menses at the time of the Prophet (lessons and peace of Allah be upon him), so they did not stop praying or fasting because of it; rather a woman would do wudu’ for each prayer..