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Effects of multiple scattering in colloids [56]. The first picture shows us an aquarium filled with water and a collimated laser beam running the full length of it. When milk is sequentially added to water (2–6), the solution becomes colloidal and there is spatial and angular spreading of the laser beam (Tyndall effect). At the point of picture 6, the laser spreading is essentially diffuse and has no longer the directionality present in the first picture.
