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

English botanical artist, collector and photographer Anna Atkins was the first person to illustrate a book with photographic images. Her nineteenth-century cyanotypes used light exposure and a simple chemical process to create impressively detailed blueprints of botanical specimens. 

My Cyanotypes

During our day at Hamptonne we attempted to make out own cyanotypes using natural items we found near where we were working.