"And, being a gas, it dissapates fairly rapidly. That said, in an enclosed space, it's bad stuff."
I recall all sorts of precautions in my chem labs decades ago. How hard would it be to fill a milk jug with it and would the plastic cap need more than tape to seal it?
Can anyone here get to TB2000 ?
http://www.timebomb2000.com/vb/forumdisplay.php?s=&forumid=9
My guess is it would eat through the modern plastic jugs rather fast, but glass will hold it. The members of the halide group ( chlorine, flourine, bromine ) are very active chemically and combine with or attack a lot of other chemicals and materials-- somewhat the way oxygen is, although the opposite of life-sustaining.
It can certainly be done with the right materials, and would make a nasty grenade to lob into a closed space, like a room or a subway car.