How 'good luck' coins thrown into a hot spring have turned one of nature's wonders into a lurid hue of green - 8th Apr 2011

(image) Psychedelic wonder: Tourists have for decades been throwing coins into the Morning Glory Pool in Wyoming for luck. These have blocked its heat vents thereby reducing its temperature and causing a chemical reaction
(Image) 1966: How the hot spring looked 45 years ago before the chemical reaction took place.

For decades it has proved a popular tourist attraction.

And while the Morning Glory Pool in Wyoming with its stunning colours continues to attract visitors from around the world its appearance has undergone a dramatic change.

Just a few decades ago, the natural hot spring was a distinctive blue colour.

But now it has taken on a deep green hue with a distinct yellow and red ring around its circumference. Read More