Polaroid

Polaroid is the name of a type of synthetic plastic sheet which is used to polarize light. The original material, patented in 1929 (U.S. Patent 1,918,848) and further developed in 1932 by Edwin H. Land, consists of many microscopic crystals of iodoquinine sulfate (herapathite) embedded in a transparent nitrocellulose polymer film. The needle-like crystals are aligned...
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