Cyanotype is a photographic printing process that produces a cyan-blue print. Engineers used the process well into the 20th century to produce copies of drawings, referred to as blueprints.

Van Dyke brown involves coating a canvas with ferric ammonium citrate, tartaric acid, and silver nitrate, then exposing it to ultraviolet light. The image created has a Van Dyke brown color when it’s completed.

Platinum prints, also called platinotypes, are photographic prints made by a monochrome printing process involving platinum.

Gum bichromate is a 19th-century photographic printing process based on the light sensitivity of dichromates. It is capable of rendering painterly images from photographic negatives.

Gumoil printing is the method for producing photos with gum, chromium salts and oil paints. It's painstaking and very expressive photographic method that combines unique author's point and documentary photography.