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" ... There is a permanent solfatara that produces native sulfur and multiple fumaroles that allow volcanic gas to escape to the atmosphere along fissures in the volcano. Within the Ijen crater there is the world's largest highly acidic lake with a pH<0.5. For reference, that's somewhere between the gastric acid within your stomach and battery acid. This acidic lake was produced by the reaction of hydrogen chloride gas with water to form hydrochloric acid. ... "