The Calotype
It is a process of fixed, discovered by Talbot, which caused non-exposed particles of silver iodide to be insensitive to light, thus avoiding the total blackening of the plate.
He called it Calotype, required exhibitions of about 30 seconds to get an adequate image in the negative.
Talbot will take an important step in the story by publishing in 1844 the first printed book with photographs.
"The Pencil of Nature", who tries to make known the calowpe and photography in society, also explaining how he has made the photographs.
With the Calotype, two characteristics of the current photograph are born: its low economic cost and the possibility of taking copies.
The calowpe uses a paper with a layer of silver nitrate and gallic acid that is revealed with sodium hyposulphite.
In this picture is possible to watch the First Negative, direct , not by contact, view of the window of your house.
Discovery made by Fox Talbot, 1835.
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