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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.
Brown Period Blood: Normal Menstrual Blood. There are some cases of periods wherein the discharge appears dark brown to almost black in color, specifically when the period cycle is almost over. This is considered normal because this occurs when blood is already old and was not released from the body quickly.hese blood clots vary in color from bright red to dark. Sometimes these clots are released during the heaviest flow of the period. The presence of clots in the flow of your menstruation may make the blood denser or thicker than usual and may appear brownish, hence brown period blood.