Soy wax is a vegetable wax derived from soybeans. One of the major benefits of soy over paraffin wax is that it burns slower so customers can feel good knowing they're getting their money's worth with a candle that lasts longer. While all candles emit some black soot while burning, soy wax burns cleaner and results in less soot than traditional paraffin. Soot is the solid particle that results from incomplete combustion of carbon containing fuels, primarily petroleum based fuels which is called petro-carbon soot. Soy wax is petro-carbon-free.
Lower soot levels help maintain pure air quality and reduce home maintenance problems associated with soot deposits. Due to the tiny size of soot particles, they can potentially penetrate the deepest area of the lung. It's been found that those who suffer from respiratory diseases like asthma, or the extremely elderly/young should especially avoid exposure to candle soot emission. Moreover, because there are several carcinogen compounds (cancer-causing agents) found in paraffin candles; in other words, virtually all of them have been considered "toxic air agents" by various environmental agencies.