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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.
The color of the menstrual blood depends on bleeding rate. Slow bleeding results in darker menstrual blood. During the first 2 days of the onset of the periods, one may see deep red color blood coming out. Whereas, the color changes to dark brown or even black near the end of the periods. This is absolutely a normal color change that happens when the blood is older and not being expelled from the body quickly.