Nope, no black soot here! Due to the all-natural ingredients used in the Boku Immune Candle, it will not create black soot. The only thing the Boku Immune Candle will produce is a lovely scent, warming feeling, and clean air! The black soot you see forming around your candles & on the walls or ceilings of your home, is a bi-product of burning wax such as Paraffin. This soot contains some of the same toxins found in diesel fuel! We are proud to say that because we use all organic coconut wax and organic essential oils, you will not experience that unsightly and hazardous soot that comes from burning Paraffin wax candles.