Calotype

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The Calotype is an early negative-positive photographic process invented by William Henry Fox Talbot over a period from January 1834 to publishing and patenting the method in January 1938. The process was also known as the Talbotype after its inventor.

On a bright day in 1835, Fox Talbot made his first photograph - of a window in his family home in Lacock Abbey, Wiltshire with an exposure time of 2 to 3 hours.