Flame and fire were humans' dangerous helpers for over a million years ago, helping them to cook food and get warm in the cold. It's used by humans for cooking, lighting, heating, esthetical purposes, and many more. Flames are part of the fire that we can see with our eyes, they can be different colors, depending on the substance that is used to fuel it. Different fuel sources in the fire result in different heat levels and different colors of the flame. Wizards and shamans added different chemical reagents to fire to cause it to change its color and create Mythical flames. Flame has always charmed humans with its beauty and power, and blue flames are an even more breathtaking spectacle. A beautiful Blue Flame custom progress bar for YouTube.