Tannerite is a binary explosive made to serve as a target marker. You mix aluminum powder with ammonium nitrate and put it out at safe distance. The shock of being struck by a rifle bullet causes it to detonate. It is meant to be loaded into a plastic jar in half pound or one pound quantities and shot.
It looks like fun. I've never had the opportunity to shoot at it. My club does not permit it's use and I haven't wanted to try it badly enough to find someone with enough land to get out in the middle where we wouldn't bother anyone.
I suspect Tannerite and all the other binary target marking explosives are going to be banned sometime soon. Please understand that I'm not saying it should be banned, I'm just saying it's going to be.
People are not content to shoot a half pound of the stuff unconstrained. Of course not. They want to try five pounds, or ten, or thirty. They want to put it in something and make it blow up.
And they don't get far enough away. An eight year old died of injuries sustained in that one.
There's lots of examples. Youtube will serve them up, just start in the side bar of any one of these.