Another way to light fireworks is by using a device called a punk. A punk is a long, thin piece of wood covered in a substance that burns very slowly, producing only heat, with no flame. A port fire is a smoldering compound as a powder compressed in a stiff paper tube.
Fireworks can be ignited using a device known as a "punk." This device consists of a long, slender piece of wood covered with a slow-burning material that generates heat but no flame.  A "port fire" is another method of firework ignition; it involves a compressed powder contained within a stiff paper tube that smolders.