Once one of the wives of the Prophet (ﷺ) did I`tikaf along with him and she was getting bleeding in between her periods. She used to see the blood (from her private parts) and she would perhaps put a dish under her for the blood. (The sub-narrator `Ikrima added, `Aisha once saw the liquid of safflower and said, "It looks like what so and so used to have.")
Reference: Sahih al-Bukhari 309 In-book : Book 6, Hadith 14 USC-MSA web (English) : Vol. 1, Book 6, Hadith 306 (deprecated)
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