An update on the Ferric gum process
Michael Andrews describes two approaches to the ferric gum process: Frank Gorga’s and Peter Friedrichsen.
Michael Andrews describes two approaches to the ferric gum process: Frank Gorga’s and Peter Friedrichsen.
Michael Andrews explains some of the technical details of the ferric gum process.
The ferric gum process is like gum bichromate in some respects but it is also radically different. Sensitiser is brushed onto the paper, the paper is dried and exposed under a suitable image, and only at this point would pigmented gum be brushed onto the exposed paper.