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Question: Explain what is cyanotype technique and how to make a cyanotype photo. Answer: Cyanotype Technique Cyanotype includes a technique of printing process in photography which produces cyan blue print. Earlier They were referred to as blueprints as Engineers often used them to produce low-cost copies of their drawings. The technique makes use of potassium ferricyanide with ferric aluminum citrate(Ware, 2008). It makes use of equal volumes of 20% ferric ammonium citrate and 8.1% (w/v) solution consisting of potassium ferricyanide. In order to increase the solution a sensitizer solution is used consisting of 6 drops of 1% solution of potassium dichromate for 2ml of every sensitizer solution. The solution is mild and can be applied on receptive surfaces then made to dry in dark places. The solution is generally applied on surface that have capabilities to soak iron solutions. At various instances watercolor paper is made use off, but at other instances wool, cotton and gelatin sizing are often used. Making Cyanotype Photo Printing of cyanotype photos can be done on surfaces that have capabilities to absorb ferric solutions, however alkaline buffered papers are often avoided. In cases of alkaline papers image gets degraded over periods of time(Antonini, 2015). Prints of this type is made from large lithography film and negatives, then digital negatives can be used for printing photographs. Positive image of cyanotype photographs can be developed by exposing it to an ultraviolet light through a contact print from negative. When UV light is combined with citrate there is chemical reaction in ferric of the solution, which helps create a blue dye commonly known as Prussian blue. The extent of the color is dependent on UV light that can depict the photograph post 10 to 20 minutes exposure to dark. It is possible to do toning of these photographs by creating several effects. Reference Lists Antonini, M. M. (2015). Experimental Photography. Thames Hudson. Ware, M. (2008). Prussian Blue: artists' pigment and chemists' sponge