Bluish
Conversely, if your body temperatures are too low, your menstrual blood can take on a bluish color—as if the blood has been frozen. Low body temperatures can cause the blood to stagnate and congeal.
You will usually see quite a bit of pain and clotting associated with bluish blood. When you regulate your temperature your blood color will normalize and your clots and pain will also dissipate.
Blackish
In some severe cases, the blood is so stuck that it can become black in color. This immovability will be accompanied by significant pain and clothing. This can be seen in women with a history of fibroids and severe endometriosis.
Women with black menstrual blood can have an incredibly difficult time conceiving, and may also put the mother at a greater risk for clotting problems that can affect the placenta in pregnancy.
