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mirkokosmos:

Blue Fire Crater - Kwah Ijen Volcano, East Java / Indonesia

At Kawah Ijen, extremely high quantities of sulfuric gases emerge at high pressures and temperatures [sometimes in excess of 600°C] along with the lava. Exposed to the oxygen present in air and sparked by lava, the sulfur burns readily, and its flames are bright blue.

http://www.smithsonianmag.com/science-nature/why-does-indonesian-volcano-burn-bright-blue-180949576/?no-ist

http://www.youtube.com/watch?v=gzi67qOtvsg (french)

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