the liquid in the boosters in your 'Whats in the chimneys' video is gasoline... or at least it should be.

check out this episode of How It's Made:
(this is the first time ive heard this female narrator. i prefer the U.S. narrator, Brooks T. Moore.)



you can watch the whole spot (c. 5 mins) or jump directly to the boosters in action at 5:03.