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Cyanotype
Cyanotype printing belong to one of the earliest photographic printing processes - also known as Preussian blue - and dates back to approx. 1842. The prints are made by brushing the light sensitive solution evenly onto the paper with a brush. After drying - the negative is put in direct contact to the paper and exposed by either sunlight or an UV-lightsource for 15-45 mins. followed by a long wash and drying.
It is however a time-consuming process but apart from that the costs involved are relatively low, a darkroom is not necessarily needed and not to forget cyanotype prints were also earlier favoured because of their resistance to fading. While early silver prints were found to be at least partly faded after a few years many concerned about the possible loss of their work began to reprint their best images in cyanotypes.
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