February 22nd, 2005 at 7:42 am
One the thruway there are huge rocks where they blasted to make way for the road, and on these said rocks, there is ice forming a sort of frozen waterfall, where water has seeped out of the rock. My question to you is, BA BA DUM, Why is the Ice Blue?
Well Kurt, the answer is this: The ice is blue because the ice is blue.
Here are the facts. Ice by its nature is tinged blue. Barely, but it’s there. The photons that enter the ice are more likely to be absorbed if they have lower energy (thus, they are at the “red” end of the spectrum). This is called “preferential absorption”. As the ice thickens, this absorption becomes more evident, and soon enough, the ice is reflecting a nice blue color.
Also, since the rocks you mention were recently blasted, there might be some manganese dissolved in the ice. This would enhance the blue color since manganese in suspension can often appear to be blue.