Existing comment:
Emerald Spring:
The Secret Is Sulfur:
A hot spring's color often indicates the presence of minerals. In a clear blue pool, the water is absorbing all the 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-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. |