I enjoyed my little quiz and it seems most who answered had at least some idea what it was and two people with a little prompting were spot on, well done Haddock and Albert. The object in question is one of the few CS gas canisters ever used on mainland Britain, it was fired during the 1981 Toxteth riots. I lived in Toxteth at the time and as a 20 year old I'm afraid to say a riot was something I was not going to miss out on.The gas canister hit a wall just above my head ( another individual was killed by a direct hit) and several seconds later I was a mess of snot, tears and puke...charming I know! A good friend of mine pulled me to safety which was nice of him as a police charge swept past and by this time they where not taking any prisoners...well not without a good pasting with a truncheon. The riots where very violent and very destructive with inbetween 700 and 1000 policemen injured, my involvement was mainly as an observer as I had friends on both sides of the line and you could walk via alleyways from behind rioters to policemen and back again quite easily.I have to admit even though people died and a chunk of the city was burned down I found it exciting but then life was different then...well at least mine was.I shall revisit this subject of the riots at a later date if anyone is interested.