Opalescence

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Opalescence is the type of dichroism of a highly dispersed system with no or small opacity. The material appears yellowish-red in transmitted light and blue in the scattered light perpendicular to the transmitted light.

Examples are the blue sky and the yellowish-red sky in the evenings. An other example can be made in an experiment: A few droplets of milk are thinned in a glass of water: the milk looks bluish. If one looks through the milk to a light source, it looks yellowish-red.

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