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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.
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.