Bergger Cyanotype KitBergger Cyanotype Kit Cyanotype is an old monochrome photographic process that makes Prussian Blue print. The technique was invented by the british scientist and astronomer John Frederick William Herschel in the 19th century. With the cyanotype technique, you can create photograms from objects plated on the sensitized paper or contact prints from a photographic (or digitally created) negative. As the emulsion is UV sensitive you can easily make