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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.
Women may experience vaginal discharge which is pretty normal and is part of a menstrual cycle. At the start of the menstrual cycle, the production of mucous is at its peak. These discharges are usually colorless. At the end of the menstrual period some women may experience dark or black period blood. These condition does not usually indicate critical condition and it can happen to just anyone.