A volcano in Indonesia produces lava that looks BLUE!
Though the molten sulfur looks red in daylight, during the night, the blue flames that reach heights of 5 meters (16 feet) are highly visible. The sulfur, which is right around its melting point at 115°C (240 °F), is pumped away from the volcano so it can cool and be collected by miners for 680 rupiahs per kilogram (about 2.5 cents per pound).
These photos were taken by award-winning photographer Olivier Grunwald. He faced extremely hazardous conditions during the shoot and had to wear a gas mask to protect himself against the toxic fumes.