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Quick Answer. During a menstrual cycle, the blood may become dark red or brown near the end of the cycle because the blood is older and is not being released as quickly. This is a normal color change during a menstrual cycle, explains WebMD. Continue Reading.
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.