How to Light Quick-Ignite Incense Charcoal Place the charcoal cube on a metal tongs or a heat-resistant surface such as a metal plate or fireproof burner. Light one edge of the cube using a lighter or gas flame. Sparks will appear within seconds, indicating the charcoal is starting to ignite. Wait until the charcoal turns light gray all over (about 30–60 seconds). Carefully place the lit charcoal into the incense burner, then add incense or oud on top. Stringed Instruments