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Foul with mud and sulphur, they seethe and splutter in their dark pits, sending up clouds of steam and sulphurous fumes. Others are of the clearest green or deepest, purest blue, through which thousands of silver bubbles shoot up to the surface, flash, and vanish. But the main use of the hot springs is found in their combination of certain chemical properties, sulphur-acid, sulphur-alkaline.
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