
right|thumb|A cyanotype of algae by 19th century botanist Anna Atkins thumb|Sir John Herschel (1842) Experimental cyanotype of an unidentified engraving of a lady with a harp, Museum of the History of Science right|thumb|Architectural drawing blueprint, Canada, 1936 thumb|Cyanotype postcard, Racine, Wis., The cyanotype (from , and , ) is a slow-reacting, photographic printing formulation sensitive to a limited near-ultraviolet and blue light spectrum, the range of 300 nm to 400 nm, known as UVA radiation. It produces a monochrome, blue-coloured print on a range of supports, and is o
right|thumb|A cyanotype of algae by 19th century botanist Anna Atkins thumb|Sir John Herschel (1842) Experimental cyanotype of an unidentified engraving of a lady with a harp, Museum of the History of Science right|thumb|Architectural drawing blueprint, Canada, 1936 thumb|Cyanotype postcard, Racine, Wis., The cyanotype (from , and , ) is a slow-reacting, photographic printing formulation sensitive to a limited near-ultraviolet and blue light spectrum, the range of 300 nm to 400 nm, known as UVA radiation. It produces a monochrome, blue-coloured print on a range of supports, and is often used for art and reprography in the form of blueprints. For any purpose, the process usually uses two chemicalsferric ammonium citrate or ferric ammonium oxalate, and potassium ferricyanide, and only water to develop and fix. Announced in 1842, it is still in use.
== History ==
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).