Soy wax will ensure great performance and strong fragrance throw. Soy wax is a vegetable wax made from the oil of soybeans. A well-made soy candle will burn cleanly and slowly. Soy is also an eco-friendly, renewable, American grown, sustainable, carbon-neutral substance. Paraffin wax is a petroleum by-product created when crude oil is refined. It is a white, odorless solid. Paraffin is the most commonly used candle wax.