Regal Flame Premium Ventless Bio Ethanol Fireplace Fuel - 12 Quart Denaturized Alcohol for Ventless bio ethanol fireplaces For child safety, Bitterant is added as a human aversive. It's overwhelming bitter taste helps prevent accidental ingestion by children and small animals. Clean, Pure Plant-Based Fuel 100% Natural Alcohol Clean Burning Fuel - NO Soot or Hazardous Fumes.