Musannaf Ibn Abi Shayba 1:995

Ibn ‘Ulayyah narrated to us, from ‘Abbad ibn Ishaq, from ‘Abdullah ibn Abi Bakr, from ‘Amrah, who said: ‘Aishah used to forbid women from looking at themselves during their menstruation at night, and she would say: "It may be yellow discharge or turbid discharge."