Ice Ih

Pronounced: ice one h, also known as ice one and is the hexagonal crystal form of ordinary ice, or frozen water.
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Compared with water, the light absorption is shifted toward slightly lower energies. Thus, ice appears blue, with a slightly greener tint than for liquid water. Since absorption is cumulative, the color effect intensifies with increasing thickness or if internal reflections cause the light to take a longer path through the ice.

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