One of a set of images captured on a 60 year old clockwork film camera and printed as a negative to emphasis the strong patterns of the tree branches. This is a hand-produced cyanotype print. Each is hand-produced, making each print unique. 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. The cyanotype process was invented by John Herschel in the 1830s and uses only iron compounds (Bob uses an improved modern recipe invented by Dr Mike Ware made from Iron Ammonium Oxalate and Potassium Ferricyanide). Cyanotype prints are permanent and should last a lifetime or more.
Bob Marshall is a printmaker using old processes invented in the Victorian era. Each of his prints is individually made by hand and is a unique work of art. Bob often creates his own photosensitive paper by coating cotton rag art paper with home-made sensitisers using brushes or sponges. Brush strokes in the final print are part of the charm of the process. In recent work Bob has incorporated other materials into the print surface to give different textures much as a painter might do. The print is made by exposing a large transparent negative on to the paper and then wet processing the print followed by thorough washing and drying. Learning from his father, Bob Marshall has been a keen phot ...
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