![]() The cyanotype was discovered, and named thus, by Sir John Herschel who in 1842 published his investigation of light on iron compounds, expecting that photochemical reactions would reveal, in form visible to the human eye, the infrared extreme of the electromagnetic spectrum detected by his father and the ultra-violet or ' actinic' rays that had been discovered in 1801 by Johann Ritter. ![]() For any purpose, the process usually uses two chemicals: ferric ammonium citrate or ferric ammonium oxalate, and potassium ferricyanide, and only water to develop and fix. It produces a cyan-blue print used for art as monochrome imagery applicable on a range of supports, and for reprography in the form of blueprints. The cyanotype (from Ancient Greek κυάνεος - kuáneos, "dark blue" + τύπος - túpos, "mark, impression, type") is a slow-reacting, economical photographic printing formulation sensitive to a limited near ultraviolet and blue light spectrum, the range 300 nm to 400 nm known as UVA radiation. ![]() Photographic printing process that produces a cyan-blue print A cyanotype of algae by 19th century botanist Anna Atkins Sir John Herschel (1842) Experimental cyanotype of an unidentified engraving of a lady with a harp, Museum of the History of Science Architectural drawing blueprint, Canada, 1936 Cyanotype postcard, Racine, Wis., c.
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