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Cyanotype is a photographic printing process that gives a cyan-blue print. The process was popular in engineering circles well into the 20th century. The simple and low-cost process enabled them to produce large-scale copies of their work, referred to as blueprints. Two chemicals are used in the process: Ammonium iron(III) and citrate Potassium ferricyanide.
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35mm Film is what we use today in film cameras.
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It had a total of 0.1 megapixels ( 10,000 pixels ). It took 23 seconds to capture its first image in December 1975.