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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.
Different period blood colors. 1  Bright red: Bright red menstrual blood signifies that the blood was recently shed and released from the body. 2  This type of blood flow is usually light and one may be having frequent periods. 3  Dark red: Dark red blood is usually older blood.t is normal for the period blood colors and textures to vary from bright red to brown or somewhat black and from thin to very thick. These changes may be a sign that the blood has been in the uterus for some time and has not been removed quickly. This may be a normal occurrence, which should not be a cause of concern.