The Kawah Ijen volcano in East Indonesia produces molten sulphur from vents in its sides, which appear bright red during the day but glow blue by night.

The Kawah Ijen volcano in East Indonesia produces molten sulphur from vents in its sides, which appear bright red during the day but glow blue by night.

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from: https://lulu-uu.tumblr.com/post/87980974821