a shoddily constructed weed-killer and sugar pop-fizz to me.
I was fortunate to go to school with a fella who 'got' Chemistry and could cook up a serious bomb or two. We called him Gelig'* and if he'd planted that bomb it would have blown out every window in the carriage and every ****** in there would've been toast
* Gelignite (q.v.)
** And any **** that wad'n a **** too.