In 1974, while still at school, I experimented with various techniques to produce “abstract” photographs. This example was created using Agfacontour, a technical film made to create equidensities. It has both negative and positive components, which, according to the exposure given produce black and white images of a given density. For example three separations could be made for each of the light, dark and intermediate tones.
This was a time consuming business, and the film was discontinued once it became possible to make separations digitally.
Having made the separations, I went on to add colour, giving each layer a different hue. I did this in two ways, first by making black and white negatives on lith film, and using the Tetenal toning chemicals to replace the black silver image with a dye layer. Later I used 24 x 36mm images together with a slide duplicator and added different coloured light for each layer. This was done by keeping the shutter open and working in the dark.
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