1840-1849
Hyalotype | Cyanotype | Calotype
Hyalotype
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The first photographic positive transparency process utilizing albumen-coated glass plates for making lantern slides. Introduced by Frederick and William Langenheim of Philadelphia in 1849. The process was also used for making large glass transparencies hung in windows as decorative works. GETTY ID: 300404046 |
Cyanotype
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Cyanotype is a photographic printing process that produces a cyan-blue print. Engineers used the process well into the 20th century as a simple and low-cost process to produce copies of drawings, referred to as blueprints. The process uses two chemicals: ferric ammonium citrate and potassium ferricyanide. (...) Wikipedia |
