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treeseed commented on the word rainbow hologram
The rainbow hologram or Benton hologram was invented in 1968 by Dr. Stephen A. Benton at Polaroid Corporation (later MIT). Rainbow holograms are designed to be viewed under white light illumination, rather than the more esoteric laser light required previously. The holograms found on credit cards are examples of rainbow holograms. These very common holograms are technically transmission holograms mounted onto a reflective surface like a metalized polyethylene terephthalate substrate commonly known as PET in the holographic industry.
_Wikipedia
February 23, 2008