Observation of a birefringent material between crossed polarizing filters reveals striking patterns and color effects. That is, light that enters the crystal is broken up into two oppositely-polarized rays that travel at different velocities. The anisotropy of liquid crystals causes them to exhibit birefringence. This light scattering is a consequence of fluctuating regions of non-uniformity as small groups of molecules form and disperse. Liquid crystal phases are generally cloudy in appearance, which means that they scatter light in much the same way as colloids such as milk.
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