Most Viewed

- The Aniline Process
- The Primuline Or Diazotype Process
- The Cuprotype Burnett's Process
- A Poitevin's Process 1870
- The Cyanofer Pellet's Process
- The Cyanotype Or Blue Process
- The Uranotype
- Graphotypy
- Dr Tl Phipson's Process 1861
- Choice Of Paper Sizing

Least Viewed

- Causes Of Failures
- Preparation Of Red Yellow Or Blue Tissues
- Tracing Process On Metal
- X's Process 1865 Secrets Of The Uranotype
- Houdoy's Process 1858
- Godefroy's Process 1858
- How To Make A Negative Drawing
- Printing On Wood Canvas Opal And Transparencies
- Guarbassi's Process 1867
- Cj Burnett's Process 1857

Godefroy's Process 1858

Float the paper upon the following solution for three minutes and hang it
up to dry:

Uranium nitrate 30 to 60 parts
Silver nitrate 8 parts
Water 100 parts

(39)

The sensitiveness increases in proportion to the quantity of uranium
nitrate. With the above formula the paper can be exposed in the camera,
or, for printing, under a negative cliche.

In printing an exposure of five seconds in diffused light gives an image
perfectly visible, and a grayish black tone; ten seconds gives a vigorous
image almost of a black color; in from fifteen to twenty seconds the image
is very strong, with the color of an engraving. In sunshine the action is
necessarily much more rapid.

The impression is developed by immersion in

Ferrous sulphate 8 parts
Tartaric acid 4 parts
Sulphuric acid 1 part
Water 100 parts

The image is rapidly developed. It is fixed by washing in water.





Next: De La Blanchere's Process 1858
Previous: Cj Burnett's Process 1857

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