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. Before their use by engineers and architects, the cyanotype process was used in the study of British algae and other plant materials, most notably by English botanist, Anna Atkins. Atkins used cyanotype prints in place of scientific illustrations, as they were easier to reproduce and had finer and more accurate detail. Atkins is considered the first female photographer.