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
- X's Process 1865 Secrets Of The Uranotype
- Tracing Process On Metal
- 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

Cj Burnett's Process 1857

"A capital process for many purposes," says Mr. Burnett, "is to float or
steep the paper in a mixed solution of bichromate of potash and sulphate
of copper, as for Hunt's chromotype process.(36) I have mixed gelatine, or
occasionally grape sugar, or both with the solution;(37) but instead of
developing it with nitrate of silver, as in chromotype, wash out the salt
unaltered by light, and develop by floating on a solution of ferrocyanate
of potassium. The purple red color of the copper salt which now forms the
picture may be modified or changed in many ways,(38) viz., by soaking the
picture, after the ferrocyanate of potassium has been washed out of the
lights, in a solution of sulphate of iron. Solutions of gallic acid,
tannic acid with alkalies of carbonate, may also be employed to modify or
change the color. This process has the advantage that one may regulate
the exact tone (black or useful neutral tint) to the greatest nicety by
the time we allow the print to remain in the iron toning bath."





Next: Godefroy's Process 1858
Previous: Preparation Of Red Yellow Or Blue Tissues

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