i don't know but that ain't good
It is normal for menstrual flow to contain the stringy black things you have described. They are probably small blood clots.
No period of Picasso's is called black period.
The period after the black death was still known as the medieval period.
The point of having different colored electrical tape is for highly specialized reasons, and these reasons differ from US and UK. Black electrical tape stands for Insulation for both US and UK, Green tape stands for Earth ground on the US, and Earth on the UK.
There is no period in history called "black magic".
If you have black blood from your period that is normal if it comes out when your not on your period than go to your doctor and get checked.
Yes, it's normal to get dark mucus during menstruation. As well as discharge and your menstrual flow, including uterine tissue, cervical mucus will be carried along with the rest of your menstrual flow. It's completely normal to see blood mucus which may look dark brown, red, or even black.
what were the reasons why the Americans were unsuccessful in the initial stages in black hawk down
Menstrual blood can be anywhere from a brown, rusty color, to a bright blood red, to a very dark (almost black) red. For me personally, my first period was brownish red and had a very light flow. I think most women who have been menstruating for a while usually see this shade near the end of their periods.
having the bubonic plague
I have not tried it, but it does not sound right. Go to kidshealth.org and try snopes.com.
Reasons 1 to 100 :- Black gold, Texas tea.