AMAZING BLUE FIRE OF KAWAH IJEN
The blue fire is ignited sulphuric gas, which emerges from cracks at temperatures up to 600 degrees Celsius (1,112 degrees Fahrenheit). Exposed to the oxygen present in air, the sulfur burns readily, and its flames are bright blue. Those gases are directly originated from the magmatic chamber under the volcano. The flames can be up to 5 metres high, It is the largest blue flame area in the world.