An Incredible Indonesian Volcano That Burns a Vivid Bright Blue Due to Sulfuric Gas Combustion

The Kawah Ijen in Java, Indonesia is an incredible composite volcano that burns a beautiful bright blue.

While it is a wonder to witness, it is a toxic mix of sulfuric gases and not lava that create the vivid color.

Great Big Story explained how this brilliant combustion occurs and what happens when the sulfur cools down.

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