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Michael Andrews

Ferric gum print by Peter Friedrichsen

An update on the Ferric gum process

Michael Andrews describes two approaches to the ferric gum process: Frank Gorga’s and Peter Friedrichsen.

Categories Gum bichromates
Gum bichromates, carbon printing and crys gell compared

The extraordinary mechanism underlying the ferric gum process

Michael Andrews explains some of the technical details of the ferric gum process.

Categories Gum bichromates
The ferric gum process

Ferric gum process – a radically different variation on gum

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.

Categories Gum bichromates

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