Blue / Sulfur / Hell
The Blue Fire Crater, as it is sometimes called, isn’t lava, but combusting sulfuric gas. The gas works its way through fissures to the surface, emerging at high pressure and extreme temperatures of up to 1,112 degrees Fahrenheit. Some of this gas ignites in flames up to 16 feet tall, and some becomes liquid sulfur that flows over the landscape. – Wired Magazine
Good chance hell, or hades, has more dark shades of blue than red-hell fire.
Those who are there know, and those going there will find out.
They will throw them into the fiery furnace, where there will be weeping and gnashing of teeth. (Matthew 13:42)
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