Some interesting facts about these candles: Soy candles burn healthy without toxins. Soy wax burns longer than petroleum-based wax. Soy candles don’t create smoke or leave black soot behind. Soy candles are environmentally friendly. They are biodegradable and made from a renewable resource derived from U.S. soybeans — and that’s good for our economy too! Sturbridge Soy Candles do not contain harmful dyes.