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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.
Other Period Colors and What They Mean. It must be noted, however, that not all women experience bright red period blood. In fact, menstruation blood can be of numerous shades, including dark red, brown or black, orange and pale red or pink. Every shade has its own causes and some may be quite normal to experience whilst others may need medical treatment.