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Retained menses: These can be another reason for black period blood. It would mean that the menses are being retained in the uterus or in vagina. It can be retained in vagina, the hymen covers the vagina completely and does not allow blood to flow out until pushed by contractions from uterus.
1. End of Cycle Blood. During your menstrual cycle, blood will lay dormant in the body and not be expelled fast enough. This happens to a lot of women until the end of their cycle where all of the blood is eventually expelled. If the blood remained in the body for a long time, it may appear dark brown or black in color.