BTSALP Specialists gathered at Luminaria Photography Studio on Saturday, September 8, 2018 to learn the process of  Cyanotype. This  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. Thanks to Dave Hyams & Christine Baczek. The Process of Cyanotype The English scientist and astronomer Sir John Herschel discovered the procedure in 1842. Though the process was developed by Herschel, he considered it as mainly a means of reproducing notes and diagrams, as in blueprints. Hard at Work Rachel Jacobs, BTSALP […]