A volcano that burns blue? 💙🌋 In East Java, Indonesia, Kawah Ijen releases sulfur gases so hot they ignite when exposed to oxygen — creating rivers of glowing blue fire at night. What looks like “blue lava” is actually burning sulfur, lighting up the crater in surreal neon flames. By daylight, this same volcano reveals a turquoise lake — the world’s largest acidic lake, capable of dissolving metal. For years, miners have worked in this toxic landscape, carrying sulfur through choking fumes. It