Let us first of all an experiment, in which a rectangular glass tank containing about two-thirds of the water, sprinkle a little water, sediment powder, the solution turbidity. Then put it in the window, select a sunny morning, about seven or eight o'clock, the sun is basically parallel rectangular glass tank fired at one end of the light through the turbid water shot out the other end. Then you can find a very interesting phenomenon: a long glass tank of water appeared blue, while from the other end of the injection to the light actually was pink, and orange.

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