These tablets are concave on one side to allow the burning material to be placed inside. Remember, charcoal tablets must be burned in a heat proof dish with at least 2 inches of sand or natural ash for insulation. Charcoal can burn up to 1,500 degrees F!
Incense can also be burned indirectly over the charcoal by placing ash or tin foil on top of the burning tablet. This will create a longer lasting burn with a more subtle, full-bodied aroma.
Charcoal tablets are most easily lit over an open flame - tweezers or tongs should always be used to hold the charcoal while it is being lit. Wait until the charcoal is glowing red hot and is covered with greyish-white ash. This can take up to 5 minutes. Fanning or blowing on the charcoal can help to ignite the entire surface.