Blue ScentsScented Soy Candle Pergamot, 145g SOY CANDLES: They are plant-based and non-toxic. As they burn, they emit almost zero harmful substances for both humans and the environment. They are superior to paraffin candles. Soy candles produce almost zero soot compared to paraffin candles. Because soot particles are very small, they can potentially penetrate deeper into the lungs. Therefore, we should avoid candles that emit high levels of soot. Soot is the solid particle that results from the incomplete combustion of carbon-containing products. Lower levels of soot help maintain clean air quality. They burn 50% longer than other candles, so soy candles are value for money. They smell stronger and last longer. Soy is a renewable and environmentally friendly material.