| http://www.w3.org/ns/prov#value | - Milk, paint and blood are examples of colloids. ???By reflecting light, these crystals ??? also called photonic crystals ??? show brilliant colors,??? Yin said. ???Ours is the first report of a photonic crystal that is fully tunable in the visible range of the electromagnetic spectrum, from violet light to red light.??? A photonic crystal controls the flow of light (photons) and works like a semic
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