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In Indonesia, there is a volcano that exudes a blue lava when it erupts. This lava is rich in sulfur. Liquid sulfur is ignited by miners and turns blue in the flame.
The Ijen volcanic complex belongs to a group of stratovolcanoes in eastern Java. The largest boiler, called Ijen, is about 20 kilometers wide.
During the day, the molten sulfur that flows from Ijen's crater looks red, but at night it turns, generating explosions up to five meters, making the blue flames visible.
Ijen - Indonesia's blue lava volcano