Stunning Electric-Blue Flames Erupt From Volcanoes Indonesia’s Kawah Ijen and other craters emit rivers of light from burning sulf. The Ijen volcano complex has some of the highest levels of sulfur in the world. This dense collection of the gas, when exposed to oxygen and lit by the molten hot lava burns blue. Unlike regular volcanoes whose bright red lava is visible in the day, Kawah Ijen’s blue burning flames can only be seen at night. #explore #indonesia #ijencrater #bluelava #bluefire #bluef