touchpaper
noun [ C ] uk/ˈtʌtʃˌpeɪ.pər/ us/ˈtʌtʃˌpeɪ.pɚ/
（烟花爆竹的）导火纸，火硝纸
a small piece of paper, usually at one end of a firework, that you light in order to start the firework burning
The instructions on the fireworks said "Light the blue touchpaper, and stand clear." 爆竹上的说明写道：“点燃蓝色导火纸，然后远离。”