touchpaper

/ ˈtʌtʃˌpeɪpə /

noun

paper soaked in saltpetre and used for firing gunpowder
light the touchpaper or light the blue touchpaper
to do something that will cause much anger or excitement

If a roman candle is intended to be fired singly, twist a piece of touchpaper round the mouth.

After lighting the touchpaper, remove to a distance; as bits of string are likely to get driven into the face, on the explosion.

He then placed the touchpaper on an old cambric handkerchief.

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