Backflow Incense Burner - The Reaper Boatman of Death Backflow BACK44Backflow Incense Burner The Reaper Boatman of Death Backflow Our range of backflow burners are made from resin and are for use with backflow incense cones only. Backflow incense creates a mist when it is lit which flows down and around the backflow burner. This mist contains natural resins and oils that can create a light residue on the burner and surface around it which can be wiped clean with a damp cloth. This product comes with full safety