The Collaborative International Dictionary
Touch-paper
Touch-paper \Touch"-pa`per\, n. Paper steeped in saltpeter, which burns slowly, and is used as a match for firing gunpowder, and the like.
Wiktionary
touch-paper
n. a strip of paper impregnated with nitre used as a fuse for firing gunpowder, fireworks etc
Usage examples of "touch-paper".
Quite heedlessly they allowed this touch-paper to lie at the door of their war magazine for any spark to fire.