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These are the most common category. These are non-conductive materials,
such as plastic or wood, which don't have free electrons. The result is that
dielectrics have relatively low reflectivity, and have a reflectivity that is
independent of light color. Because they don't interact with the light
much, many dielectrics are transparent. The ambient, diffuse and specular
colors tend to be the same.
Powdered dielectrics tend to look white because of the high surface area
between the dielectric and the surrounding air. Because of this high surface
area, they also tend to reflect diffusely.