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A hot spring's color often indicates the presence of minerals. In a clear blue pool, the water is absorbing all colors of sunlight except one, blue, which is reflected back to our eyes. Here in Emerald Spring's pool, another factor joins with light refraction to give this spring its color. The 27-foot (8 m) deep pool is lined with yellow sulfur deposits. The yellow color from the sulfur combines with the reflected blue light, making the hot spring appear a magnificent emerald green.
Survey Date: August 11, 1998
Geographic Area: Gibbon Canyon
Thermal Region: Norris Geyser Basin
Thermal Complex: Back Basin
Ranger District Contact: Norris District, Al Miller (307) 344-2501
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