blue fire
"Blue fire" refers to flames that appear blue in color, typically caused by the combustion of certain materials or chemicals. This phenomenon occurs when the temperature of the flame is high enough to emit blue light, often seen in natural gas flames or when burning specific metals like copper.
In nature, blue fire can also be observed in volcanic activity, such as the Kawah Ijen volcano in Indonesia, where sulfur gases ignite and create a striking blue glow. The blue color indicates a hotter flame, often associated with more complete combustion compared to yellow or orange flames.