- An intricate and impressive backflow incense burner in a glowing cave design. This burner features glowing crystals which change colour in a geode-like opening. When the cone is lit the smoke from the cone cascades downwards in a mesmerising waterfall effect to pool at the bottom. Beautiful to watch. This item must be placed on a heatproof surface. When backflow incense burns the mist can leave a light residue on the burner and the surface the burner is placed on. This is from natural oils and resins within the incense and can be wiped clean with a damp cloth. For use with backflow incense cones only.