The liquid itself does not ignite like alcohol, and it will not burn without a wick to wick the liquid, making it safe to use. Because the oil tank is made of plastic, it will not crack if dropped and the liquid candle will not spill so you can use it with confidence. Minimal odors and oil smoke during use. Kameyama Liquid Candles are made from natural gas source (GAS TO Liquids). This is a clean, environmentally friendly product that contains little impurities. Please use this product in a lantern or hoya. This product is disposable and cannot be refilled with liquid.