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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.
Although black or brown colored discharge during menstrual flow is fairly common among women, the situation doe not indicate severe disorders. This is because discoloration is commonly a result of the long menstrual period. The long period means that the blood has become oxidized thereby causing the change in color.