Calotype process

Calotype process
Invented by W.H. Fox Talbot in 1839. Paper was coated with silver iodide and a solution of silver nitrate and gallic acid. Following exposure the paper was developed in a silver nitrate solution.
Search SWPP and BPPA ...

Calotype process - first negative/positive process, invented by W.H. Fox Talbot in 1839. Paper was coated with silver iodide and a solution of silver nitrate and gallic acid. After exposure the paper was developed in a silver nitrate solution.

Although most of the early work on the Sabatier effect was done using collodion plates, at least one person noticed the effect with the old waxed paper Calotype process.

In February 1841, Talbot obtained a patent for the calotype process. At first, he was selling individual patent licences for £20 each, ...

1841: William Henry Talbot masterminds the Calotype process. This process was able to make multiple copies of a single photograph by using the negative-positive process. ...

-Waxed paper process is an early form of photography. A variation on the calotype process.

See also: Calotype, Image, Photographer, Exposure, Photography