On first use, let the candle burn for at least two hours. This lets the wax melts uniformly across the surface, ensuring the candle burns evenly. Before each burn, use a wick trimmer to adjust the length to roughly 0.5cm, so the candle will burn cleanly for longer. Cowshed Candles are made from 100% natural soy wax. Soy wax is a completely renewable source making it environmentally friendly and sustainable. The wax provides a clean burn and a pure scent throw. The wax is produced without damaging the ecosystem and is 100% biodegradable so easily washed out with soap and water if there are any mishaps. Approximate burn time: 60 hours..