I googled "yellow phosphorus," and this page, run by an Angelo State University professor, says that it's the same as white phosphorus, which I understood to be

I googled "yellow phosphorus," and this page, run by an Angelo State University professor, says that it's the same as white phosphorus, which I understood to be dangerous. http://www.angelo.edu/faculty/kboudrea/demos/burning_phosphorus/burning_phosphorus.htm http://www.angelo.edu/faculty/kboudrea/demos/burning_phospho... The page explains: "White phosphorus is highly reactive, and spontaneously ignites at about 30°C in moist air. It is usually stored under water, to prevent exposure to the air. It is also extremely toxic, even in very small quantities." Aside from cutting power to the headlights, I wonder how BMW keeps the white phosphorus from causing trouble during a crash.