Holograms have become an everyday experience because of two technologies: the "white-light transmission" or "rainbow" hologram that is viewable in white light, and the inexpensive replication of holograms by embossing in plastic. Here, we will examine the first of these as might be found in a typical "silvery blob" hologram from cereal box, T-shirt, or magazine cover, and try to address some of the questions about them that I get asked most often. Find a hologram that has large areas that appear in a single color, as some multicolor holograms are too complex for these experiments.
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