2026 International Day of Light Celebration in Arizona.
About the Cyanotype process.
Cyanotypes. Photochemical blueprinting (also known as cyanotype process , from the Greek kyanos-blue) is one of the historically oldest photographic techniques that produce intensively blue pictures. Today it is classified as the member of a family of alternative photographic processes. This process was developed in 1842 by the English natural scientist and astronomer Sir John Frederick Herschel (1792-1871). Cyanotype was thus the third photographic technique after daguerrotype and talbotype (calotype), with which stable photographic pictures could be obtained. Unlike previous silver-based techniques, cyanotype is based on the light sensitivity of iron(III) complexes, which makes it comparatively inexpensive. Herschel himself is the author of today’s common expressions such as negative, positive, photograph and snapshot. Figure 1: Sir John Frederick Herschel, English astronomer, mathematician, chemist and pioneer of photography, especially the cyanotype The intensive blue color of cy...
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