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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.
Causes of Black Period Blood. Brown or dark discharge can be due to remnants of old endometrial tissues. This happens when the uterus is cleaning out old tissues and changing into newer ones. While in other cases the blood is exposed to oxygen thus the color change.