The first menstruation after stream of people color slants black how to return a responsibility

The first menstrual color after abortion is black, which is generally a normal phenomenon. Because abortion will cause damage to the endometrium, and it takes a certain amount of time to repair the damaged parts. After abortion, menstrual tide will be less, and there will be blackening. This situation may also be caused by cold, menstrual blood blocked, difficult to eliminate, will form congestion, thus looking black.