823K views · 1.5K reactions | The volcano with blue ‘lava’ and a lake of pure acid… With a lake of pure acid and strange blue flames that emanate from beneath the volcano, Kawah Ijen is surely one of the most dangerous places to work in the world. Yet people risk their lives to work at the crater…geologist Dr Glyn Williams-Jones and filmmaker Régis Etienne explain why. #Volcanic | BBC Earth | Facebook