In Ljen Caldera at E Java Indonesia there are several volcanoes are located in a 15km diameter, Kawah Lien is one of the volcano of the volcano series and use to mining Sulfur. Most of volcanoes in E java, it is difficult to accessible. But Kawah volcano has easy accessible it helps to mining operations of sulfur. The last magmatic eruption is happened in Kawah Ljen was 1817 so this volcano series is very tourist attracted place in Indonesia.
In below those amazing picture shows how the operation of sulfur mining happening in there, this luminous blue color coming when sulfur burned it melts to red liquid and emits a blue flame. Inside the volcano we can observe it well because of the dark environment.
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