Cyanotype

"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 hyposulphite of soda as early as 1839. In the early days the paper was coated with iron salts and then used in contact printing. The paper was then washed in water and resulted in a white image on a deep blue background. (Apart from the cyanotype process, Herschel also gave us the words photography, negative, positive and snapshot.)"Spike MacGee

"The Phoenix artist Annie Lopez wanted to stand out among her contemporary peers. Instead of trying to invent something utterly new, she has been turning to a 174-year-old photographic printing process — cyanotypes, once used for copying architectural drawings — and giving it her own distinctive twist.

Ms. Lopez created a dress pattern cut from tamale wrapping paper and printed all over with cyanotypes, which have a distinctly cyan-blue color. She printed the cyanotypes herself, in a process that took about 25 minutes per sheet of images. No darkroom was needed." Ted Loos

She has also done her work on clothing!