Cyanotype

The cyanotype is a photographic process old Monochrome positive, by the means which one obtains a photographic Tirage Prussian blue, blue Cyan.

This technique was developed in 1842 per the English scientist and astronomer John Frederick William Herschel.

This process uses two chemicals:

  • ferric Citrate ammonium (green)
  • Ferricyanide of potassium

The first book using this process is British Algae (1841-1853) of the British Anna Atkins (1799-1871).

Conservation in time

Contrary to the majority of the old and recent processes of reproduction, the cyanotypes do not like the basic environments , the risk being to see the image fading.

Another particular characteristic of the cyanotype is its propensity with regeneration: the images having faded, because of an exposure prolonged to the light, can often return to their tonality of origin by storing them in an obscure place.

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