I never knew that, I never really thought about it before
It is some nasty stuff. It will stick to whatever it lands on, and putting water on it seems to make it flare up even more.
I used to make it when I was a kid, but I stopped when I burned a big old section of grass in the back yard. I knew I was gonna get in trouble. Sometimes I do not even know how in the heck I survived my younger years without serious injury or worse.