When was the cyanotype process first used?
When was the cyanotype process first used? 1842 John Hershel’s cyanotype print ‘Lady with Harp’. The cyanotype process, also known as the blueprint process, was first introduced by John Herschel (1792 – 1871) in 1842. Sir John was an astronomer, trying to find a way of copying his notes. Herschel managed to fix pictures using […]