Brown or Rusty

If your menstrual blood is dark brown or rusty, your body temperature may be affecting the quality of the blood. If your temperatures are too high in the early part of your cycle (above 97.8 or so), your blood will have a tendency to take on a brown or rusty color—almost as if the blood has been slightly scorched.

High body temperature also interrupts the timing of ovulation, which negatively affects your fertility.

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.