Sometimes it’s good to have the blues 😍🌋💙 The electric-blue light from the Kawah Ijen volcano in Indonesia is visible only in the darkness. #ParadiseIslands | National Geographic TV

El azufre en combustión desprende espectaculares llamas azules en el volcán Kawah Ijen, en la isla indonesia de Java, que solo son visibles de noche. | Revista National Geographic en español

The Phenomenon of Blue Lava Despite its name, blue lava isn't actually molten rock glowing blue. It's a breathtaking visual effect found at the Kawah Ijen volcano in Indonesia. This stunning blue color is caused by the combustion of high-pressure sulfuric gases. As these gases escape from volcanic vents and come into contact with oxygen-rich air, they ignite and burn with a vibrant, electric blue flame. This spectacular "blue fire" can be seen flowing down the volcano's slopes, creating the illu